The AMA revised the office E/M guidelines in 2021, replacing history and examination requirements with level selection based on medical decision making or time. Those rules remain in effect for 2026. CMS also continues to pay add-on code G2211 with office visits. The CY 2026 Physician Fee Schedule final rule extended that add-on to home and residence E/M visits.

Both Codes Describe Established Patient Office Visits

CPT codes 99213 and 99214 report office or other outpatient visits for established patients. An established patient has received professional services from the same physician or another physician of the same specialty and subspecialty in the same group within the past three years. The two codes differ only in the level of medical decision making or the total time documented. History and examination are still recorded as medically appropriate. They no longer determine the code level.

Medical Decision Making Separates the Two Levels

Medical decision making has three elements: the number and complexity of problems addressed, the amount and complexity of data reviewed and analyzed and the risk of complications from patient management. A visit qualifies for a given MDM level when two of the three elements meet or exceed that level. 99213 requires low MDM. 99214 requires moderate MDM.

Prescription drug management is one of the most common reasons a visit reaches the moderate risk level. A patient with two stable chronic conditions whose medications are reviewed and adjusted or continued will often meet 99214 on problems and risk alone. A single acute uncomplicated illness treated with over-the-counter guidance generally supports 99213.

A problem counts toward MDM only when it is addressed during the visit. A note stating that another clinician manages a condition does not qualify unless the provider evaluates or treats it. A referral without evaluation also falls short of addressing the problem. This distinction frequently explains why external audits reduce visits from 99214 to 99213.

Total Time Offers an Alternative Path

Practices may instead select the level based on the provider’s total time on the date of the encounter. 99213 requires at least 20 minutes. 99214 requires at least 30 minutes. Time includes face-to-face and non-face-to-face work by the physician or other qualified health care professional on that date. Activities that count toward total time include the following:

• Preparing to see the patient, including reviewing tests and records
• Obtaining or reviewing a separately obtained history
• Performing the examination and counseling the patient or family
• Ordering medications, tests or procedures
• Documenting clinical information in the medical record
• Coordinating care when it is not separately reported

Time spent by clinical staff, travel time and time spent on separately reported services do not count. Documentation should state the total time and summarize the activities performed. A note that records only a start and end time for the face-to-face portion often understates the time that qualifies.

G2211 Adds Value to Longitudinal Care Visits

Medicare has paid add-on code G2211 with office and outpatient E/M visits since January 1, 2024. The code recognizes the added complexity of visits that form part of an ongoing relationship for a serious or complex condition. G2211 can be reported with either 99213 or 99214 when documentation supports that continuing relationship. The CY 2026 final rule extended the add-on to home and residence E/M codes 99341 through 99350.

Medicare generally does not pay G2211 when the base visit carries modifier 25. Since 2025, CMS has allowed an exception when the other same-day service is an annual wellness visit, a vaccine administration or another Part B preventive service. Billing teams should confirm that the documentation describes the longitudinal relationship before attaching the add-on.

Documentation Gaps Drive Undercoding and Audit Risk

Many providers default to 99213 for visits that meet moderate MDM. Common causes include incomplete documentation of chronic conditions, omitted data review and failure to record prescription decisions. The result is lost revenue on visits that were fully earned.

Overcoding carries the opposite risk. CMS contractors and the OIG regularly review E/M level distribution. Practices that bill 99214 far more often than specialty peers may face targeted probe reviews. Internal reviews that compare documentation against selected levels identify both patterns early. The process to audit a practice’s own billing provides a practical structure for those reviews.

Specialty Context Shapes the Expected Mix

Expected ratios of 99213 to 99214 vary by specialty. Internal medicine and family practices managing several chronic conditions typically report a higher share of 99214 visits than specialties focused on single acute problems. Practices can review those patterns alongside the conventions covered in the internal medicine coding overview.

Benchmarks are most useful when compared month over month for each provider. Specialty-focused internal medicine billing services track E/M distribution against peer data during routine reporting. Significant shifts in that distribution usually point to documentation habits rather than changes in patient complexity.

Final Thoughts

The choice between 99213 and 99214 rests on documented decision making or time, not on habit. Medlife MBS reviews E/M documentation, identifies undercoded visits and monitors level distribution against specialty norms. Through medical billing services built on accurate coding, Medlife MBS helps practices collect the full value of every established patient visit. Contact the Medlife MBS team to schedule an E/M documentation review.

The post 99213 vs 99214: Choosing the Correct E/M Level appeared first on MedLifeMBS.

CMS maintains the national POS code set used on professional claims by Medicare, Medicaid and most commercial payers. The CY 2026 Physician Fee Schedule final rule changed how indirect practice expense is allocated between facility and non-facility settings. For practice owners and billing managers, that change makes accurate POS reporting more consequential in 2026 than in prior years.

The POS Code Identifies Where the Service Took Place

Professional claims report the POS code in item 24B of the CMS-1500 form or in the matching field of the 837P electronic transaction. Each code represents a setting, such as a physician office, a hospital outpatient department or a patient’s home. For most services, the code reflects where the patient received the face-to-face encounter. Payers use it to apply the correct fee schedule amount and to identify services that belong on a separate facility claim.

Patient registration status can override the physical location of the visit. When a patient is registered as a hospital inpatient or outpatient at the time of service, Medicare expects the corresponding hospital POS code even if the encounter takes place in a physician office inside the hospital building. The determining factor is the patient’s registration, not the address printed on the practice’s letterhead.

Common POS Codes Used in Physician Billing

The national code set contains dozens of codes. A relatively small group accounts for most claims submitted by physician practices.

The full CMS code set also includes codes for pharmacies, schools, correctional facilities, mobile units and other locations. Codes that CMS does not classify as facility settings are generally paid at the non-facility rate under the Medicare Physician Fee Schedule. Each code should be confirmed against the current CMS list before it is added to a practice management system.

Facility and Non-Facility Rates Set the Payment

Under the Medicare Physician Fee Schedule, each service carries separate practice expense values for facility and non-facility settings. When a service is performed in a hospital or ambulatory surgical center, the facility bills separately for overhead such as staff, space and equipment. The physician’s payment is reduced to avoid paying those costs twice. In a physician office, the practice bears those expenses and receives the higher non-facility rate.

Reporting POS 11 for a patient seen in a hospital outpatient department therefore overstates the payment the practice is entitled to receive. The OIG has published several audits finding Medicare overpayments to physicians who reported non-facility codes for services furnished in hospital settings. Overpayments of this kind must be reported and returned under the Medicare 60-day overpayment rule once they are identified.

Hospital Outpatient Settings Require POS 19 or 22

Hospital-based clinics are a frequent source of POS errors. A provider-based department located on the hospital’s main campus uses POS 22. A department located off campus uses POS 19, which CMS introduced in 2016 to support site-neutral payment policy. Both codes trigger the facility rate for the professional service. Practices that see patients at more than one location should map each address to its correct POS code in the practice management system.

Telehealth Claims Use POS 02 or POS 10

Medicare telehealth services are reported with POS 10 when the patient is at home and POS 02 when the patient is at another location, such as a clinic or workplace. Since January 1, 2024, Medicare has paid POS 10 claims at the non-facility rate. POS 02 claims continue to be paid at the facility rate. The current reference to telehealth CPT codes and modifiers summarizes the modifiers payers most often require with each code.

Commercial payers do not always follow Medicare policy. Some continue to require the in-person POS with a telehealth modifier. Payer policies should be confirmed each year and stored with the corresponding contract.

POS Errors Lead to Denials and Recoupments

A POS code that conflicts with other claim data often triggers an automated payer edit. Common examples include the following:

• An inpatient POS reported with an office E/M code
• POS 11 reported for a service furnished in a hospital outpatient department
• A telehealth POS reported for a service that is not on the Medicare Telehealth Services List
• POS 24 reported without a matching ambulatory surgical center claim
• A POS that does not match the service location address on the claim

These mismatches rank among the reasons insurance companies deny claims that trace back to front-end data entry. Each one is preventable when location data is captured accurately before the claim is created.

Accurate POS Reporting Starts at Scheduling

Most POS errors originate before charge entry. Scheduling templates should capture the actual location of each visit, including telehealth encounters and hospital-based clinic sessions. Billing systems can then assign the correct POS code by location rather than relying on manual selection. Professional medical coding services review POS assignment alongside CPT and modifier selection during charge review.

Periodic audits of POS by provider and location reveal patterns that single-claim reviews miss. Dedicated denial management services track POS-related denials by cause so recurring setup issues are corrected at the source. Those corrections protect both first-pass acceptance and payment accuracy.

Final Thoughts

Place of service codes affect payment as directly as CPT codes. They often receive far less attention during claim review. Medlife MBS helps practices map every location to the correct POS code, apply payer-specific telehealth rules and audit claims before submission. Through medical billing services that verify location data on every claim, Medlife MBS protects reimbursement across office, hospital and virtual settings. Contact the Medlife MBS team to review how current POS settings affect practice revenue.

The post Place of Service Codes and How They Affect Payment appeared first on MedLifeMBS.

CMS released an updated version of Form CMS-R-131 in March 2026. The prior version could no longer be used after May 12, 2026. The current form is valid through March 31, 2029. For practice owners and billing managers, the form change is a timely reason to review how ABNs are issued, completed and reported on claims. Practices that prefer to outsource this work often turn to specialist medical coding services.

An ABN Shifts Liability Only When It Is Valid

The ABN transfers financial liability to an Original Medicare beneficiary when the practice expects Medicare to deny an item or service. That transfer applies only if the notice is delivered correctly and completed in full. The detailed requirements appear in Chapter 30 of the Medicare Claims Processing Manual. A defective notice is treated as if no notice were given.

Medical necessity is among the most frequent reasons medical claims get denied. The ABN is one of the few tools that preserves revenue after such a denial. It works only when every requirement is met before the service is furnished.

Most Defective ABNs Share the Same Errors

Billing reviews tend to find the same handful of errors across practices of every size and specialty. Each one can make an otherwise reasonable notice unenforceable.

Each of these errors produces the same outcome. If Medicare denies the service, the practice generally cannot collect from the patient. Most can be prevented with a short checklist reviewed at the time of scheduling.

Routine and Late Notices Are the Most Common Failures

Some practices ask every Medicare patient to sign an ABN as a precaution. CMS prohibits this approach. A notice issued without a specific reason to expect denial gives the beneficiary no meaningful information. A valid ABN identifies the particular item or service and explains why Medicare may not pay for it, such as a frequency limit or a diagnosis that does not meet coverage criteria.

Timing causes similar problems. The notice must be delivered far enough in advance for the patient to consider the options and ask questions. Presenting an ABN after a patient is gowned or after a specimen has been collected rarely meets that standard. ABNs are never used in emergency or urgent care situations.

Incomplete Fields Invalidate Otherwise Correct Notices

The CMS form instructions require specific entries in each section of the notice. The form must list the items or services, give a reason for expected noncoverage and include a good-faith cost estimate. Medicare numbers and Social Security numbers must not appear anywhere on the form. The beneficiary then chooses one of three options:

• Option 1: The patient receives the service, Medicare is billed and the patient pays if Medicare denies, with appeal rights preserved
• Option 2: The patient receives the service and pays directly, Medicare is not billed and no appeal is available
• Option 3: The patient declines the service and owes nothing

Staff must not preselect an option on the patient’s behalf. If a patient refuses to choose or sign, staff should annotate the notice to record the refusal and keep a copy on file. CMS expects practices to retain each ABN for five years from the date of service when no other requirement applies.

Claim Modifiers Must Match the Notice on File

An ABN protects the practice only when the claim reports it correctly. Medicare uses four HCPCS modifiers to identify liability notices. A mismatch between the modifier and the notice on file can shift liability back to the practice.

Modifier GA indicates that a required ABN was issued and is on file. GZ indicates that the practice expects a medical necessity denial but did not obtain an ABN, which leaves the practice liable. GX reports a voluntary ABN for a service Medicare never covers. GY reports a statutorily excluded service for which no notice was required.

These modifiers follow the same reporting logic as other modifiers in medical coding. Charge reviews should confirm that every GA line has a signed notice on file. A pattern of GZ lines often signals that the scheduling team is missing opportunities to issue valid notices.

Denied ABN Claims Still Require Follow-Up

When Medicare denies a claim billed with modifier GA, the patient receives a Medicare Summary Notice and becomes responsible for the balance. Patients who chose Option 1 keep their appeal rights. When Medicare pays a claim that the patient already paid, the practice must refund the amount collected beyond applicable cost sharing.

Clear communication at this stage prevents many patient billing disputes. A statement that references the signed ABN and the Medicare decision helps the patient understand the charge. Prompt follow-up also keeps these balances from aging into collections.

Denials on claims with a valid notice and denials caused by a defective one both deserve review. Dedicated denial management services group these outcomes by cause so recurring issues can be corrected at the scheduling stage. Those corrections reduce the number of write-offs tied to medical necessity.

Final Thoughts

A valid ABN converts an expected Medicare denial into a collectible patient balance. A defective one leaves the practice with the write-off. Medlife MBS reviews ABN workflows, confirms current form versions and checks modifier reporting before claims leave the practice. Through medical billing services that connect front-desk notices to claim submission, Medlife MBS protects revenue on every Medicare service. Contact the Medlife MBS team to schedule a review of current ABN processes.

The post Common ABN Mistakes That Leave Practices Unpaid appeared first on MedLifeMBS.

For practice owners and billing managers, confusing the two systems leads to misdirected claims, missed authorizations and patient balances that cannot be collected. Recent CMS rules have narrowed some differences, including utilization management requirements that took effect in 2024 and prior authorization timeframes that began on January 1, 2026. Many operational differences remain. Each one affects how a claim should be prepared.
Specialist medical billing services can take much of this workload off an in-house team.

Claims Follow Different Paths From the Start

Original Medicare claims are submitted to the MAC assigned to the practice’s jurisdiction and paid under the Medicare Physician Fee Schedule. Medicare Advantage claims are submitted to the plan listed on the patient’s member card. Payment terms come from the practice’s contract with that plan. A claim sent to the MAC for an MA enrollee is denied, which makes accurate insurance eligibility verification the first control in the process.

Timely filing shows how far the two systems can diverge. Original Medicare allows 12 months from the date of service. Many MA contracts set shorter windows, a difference covered in detail in the review of timely filing limits by payer. Billing teams should record each plan’s deadline at contract setup rather than relying on the Medicare standard.

Prior Authorization Drives Most MA Billing Differences

Original Medicare requires prior authorization for a limited set of services, such as certain hospital outpatient procedures and selected durable medical equipment. CMS expanded that scope modestly through the WISeR Model, which began on January 1, 2026 in six states. Medicare Advantage plans apply prior authorization far more broadly. A missing approval remains one of the most frequent reasons MA claims are denied.

The CMS Interoperability and Prior Authorization final rule, CMS-0057-F, requires MA organizations to decide urgent requests within 72 hours and standard requests within seven calendar days beginning January 1, 2026. Plans must also give a specific reason for every denial. The 2024 Medicare Advantage final rule, CMS-4201-F, requires approvals for a course of treatment to remain valid as long as the care is medically necessary. It also gives enrollees in active treatment who switch plans a minimum 90-day transition period without new authorization requirements.

Practices that track each authorization by plan, service and expiration date avoid most of these denials. Workflows built on established prior authorization best practices also reduce peer-to-peer reviews and resubmissions. Each approval number should be attached to the claim before submission.

Payment Rates Depend on Network Status

Contracted providers are paid according to the rates in their MA agreement, which are often expressed as a percentage of the Medicare fee schedule. Non-contracted providers that treat an MA enrollee are generally paid the amount they would have received under Original Medicare, minus the enrollee’s cost sharing. Federal rules at 42 CFR 422.520 also require MA plans to pay clean claims from non-contracted providers within 30 days.

Balance billing is limited in both settings. A contracted provider cannot collect more than the applicable cost sharing from an MA enrollee. Errors in a plan’s fee schedule can therefore be corrected only through the plan itself. Regular payment reviews are essential for every MA contract a practice holds.

Risk Adjustment Makes Diagnosis Coding More Visible

CMS pays MA plans a monthly amount adjusted for each enrollee’s health status through the CMS-HCC risk adjustment model. The 2024 version of that model, known as V28, reached full implementation for payment year 2026. Because plans depend on complete diagnosis capture, many MA organizations request records and conduct chart reviews more often than Medicare contractors do.

Diagnoses reported for risk adjustment must be supported by documentation showing that the condition was monitored, evaluated, assessed or treated during the encounter. Practices that rely on professional medical coding services reduce the documentation gaps that lead to failed record reviews. Accurate coding also protects the practice when plans conduct retrospective audits.

Patient Liability Notices and Appeals Differ

The Advance Beneficiary Notice applies only to Original Medicare. When an MA enrollee requests a service the plan may not cover, the practice or the enrollee can request a pre-service organization determination from the plan. A contracted practice that furnishes a non-covered service without that determination may be unable to bill the enrollee for it.

Appeals follow separate tracks as well. Original Medicare claims move through five levels beginning with a MAC redetermination, which must be requested within 120 days of the initial determination. MA disputes begin with the plan. Contracted providers often follow the dispute process in their agreement rather than the enrollee appeal process.

Front-End Checks Prevent Most Misdirected Claims

Most billing problems between the two systems begin at registration. The annual enrollment period, which runs from October 15 to December 7, 2026, will move many patients into new coverage on January 1, 2027. Patients often present an outdated card during the first weeks of the new plan year. Effective front-end controls include the following:

• Verify the type of Medicare coverage at every visit, not only at intake
• Confirm the MA plan’s prior authorization list for each scheduled service
• Record contract-specific timely filing and appeal deadlines
• Identify Medicare Secondary Payer situations before the claim is created
• Collect MA cost sharing based on the plan’s benefit rather than Original Medicare amounts

Patients with employer coverage alongside Medicare add a further step. The order of payment follows established coordination of benefits rules that apply to both Original Medicare and MA enrollees. Reviewing those rules before January prevents many of the misdirected claims that appear early in each plan year.

Final Thoughts

Medicare Advantage and Original Medicare share a name but differ in claim routing, authorization, payment and appeals. Medlife MBS helps practices verify coverage type before each visit, track plan-specific requirements and route every claim to the correct payer. Practices preparing for the 2027 plan year can rely on Medlife MBS prior authorization services to keep MA approvals current and claims moving. Contact the Medlife MBS team to review how current workflows handle both Medicare systems.

The post Medicare Advantage vs Original Medicare Billing Differences appeared first on MedLifeMBS.

Industry estimates of underpayment rates vary widely, yet even a small percentage across a full year of claims represents meaningful revenue for a specialty practice. For practice owners and billing managers, recovery in 2026 depends less on chasing individual claims and more on building a repeatable comparison between what each contract promises and what each remittance actually pays. For practices without the staff to manage this in-house, dedicated accounts receivable management services are one option.

Identifying Underpayments Through ERA and Adjustment Codes 

The electronic remittance advice, known as the 835 transaction under HIPAA, reports the allowed amount, the paid amount and the reason for every adjustment on each service line. When a payer allows less than the contracted rate, the difference is commonly reported with group code CO and reason code 45, which indicates that charges exceed the fee schedule or maximum allowable amount. Because CO-45 also accompanies every legitimate contractual write-off, payment posting staff often adjust the balance automatically without questioning the allowed amount. Understanding the difference between CARC and RARC codes helps posting teams recognize when an adjustment reflects a payer error rather than an expected write-down.

Comparing billed charges with total payments does not reveal these errors. The review must take place at the service-line level, where each code, modifier and unit is measured against the expected rate for that date of service.

Common Causes of Medical Claim Underpayments 

Underpayments rarely result from a single payer decision. They usually reflect a configuration error in the payer’s adjudication system or a gap in the practice’s own contract records. The same error then repeats on every similar claim.

Medicare-based contracts add another variable. Many commercial agreements pay a percentage of the Medicare Physician Fee Schedule, which CMS updates each January. When a payer continues to apply 2025 rates to 2026 claims, every claim for that service is underpaid until the error is corrected. Underpayments of this kind are among the most persistent hidden revenue leaks because they look identical to normal contractual adjustments.

How to Calculate Expected Payments From Payer Contracts

A practice cannot detect variance without first defining what each claim should pay. An expected payment model converts contract terms into a rate for every code the practice bills with each payer. Building one requires the following inputs:

• The executed base agreement with every amendment and its effective date
• The fee schedule exhibit or the Medicare percentage and locality it references
• Contract rules for multiple procedures, modifiers, bundling and carve-outs
• The providers, locations and tax identification numbers the contract covers
• 835 data showing allowed amount, paid amount, patient responsibility and adjustment codes

Many practice management systems can store expected rates and flag variances during payment posting. Where that capability is unavailable, a model covering the 20 to 30 highest-volume codes for each major payer often captures most of the recoverable revenue.

How to Detect Recurring Payer Underpayment Patterns

A single underpaid claim may be an isolated processing error. The same variance on every claim for one code, one provider or one payer indicates a systemic problem that will continue until the payer corrects its configuration. Grouping variances by payer, code and modifier separates one-time issues from patterns worth escalating.

Tracking a payment variance rate alongside other revenue cycle KPIs gives leadership a monthly view of contract compliance. A rising variance rate after January 1 often points to a fee schedule that was not updated, while a sudden change for a single provider may indicate an enrollment or credentialing issue.

How to Recover Underpayments From Insurance Payers

Recovering an underpayment requires the practice to show exactly what the contract required and what the payer paid instead. The approach depends on whether the variance affects a handful of claims or an entire category of services.

How to Dispute Individual Underpaid Claims

Most commercial payers handle underpayment disputes through a reconsideration or appeal process defined in the provider manual. A successful request cites the contract section, the expected rate, the amount paid and the variance for each line. Payers also set deadlines for payment disputes that are often measured from the remittance date, so underpaid claims should be reviewed within weeks of posting rather than at year end.

Resolving Systemic Payer Underpayment Errors

When a pattern affects many claims, the practice should raise it with the payer’s provider relations representative and request both a configuration correction and reprocessing of the affected claims. Many states also enforce prompt payment laws that require insurers to pay clean claims accurately within defined periods, which can strengthen the practice’s position. Dedicated denial management services apply the same root cause discipline to underpayments that they apply to denials.

Each recovery item then needs an owner and a follow-up date until the additional payment posts. Professional accounts receivable management tracks reprocessed claims alongside other open balances so that a promised correction does not quietly expire.

Final Thoughts

Underpayments remain one of the least visible sources of lost revenue because they rarely trigger a denial or an aging alert. Medlife MBS helps practices build expected payment models from their payer contracts, review every remittance against those rates and pursue recoverable variances before dispute deadlines close. Through medical billing services that measure payment accuracy as closely as claim volume, Medlife MBS ensures that each contracted rate is reflected in the revenue a practice actually receives.

The post How Practices Identify and Recover Payer Underpayments appeared first on MedLifeMBS.

CMS revised the rule in the CY 2025 Physician Fee Schedule final rule, effective January 1, 2025, changing both the standard for when an overpayment is identified and the timeline for investigating it. Practices reviewing their 2026 claims should understand these changes, because routine internal audits are now the most common way small and midsize practices discover that they were paid more than they should have been. Many practices now hand this work to accounts receivable management services so their staff can focus on patients.

Common Types of Medicare and Medicaid Overpayments

An overpayment is any amount a practice receives from Medicare or Medicaid that it is not entitled to retain. The rule extends well beyond obvious billing mistakes. Common sources in physician practices include the following:

• Services billed at a higher level than the documentation supports
• Duplicate payments for the same service and date
• Payments for services rendered by a provider who was not enrolled or eligible to bill
• Primary payments received from Medicare when another plan was responsible
• Services that lacked required documentation, orders or signatures
• Credit balances created when two payers paid the same claim

The provider’s intent does not determine whether an overpayment exists. An unintentional coding error creates the same repayment obligation as any other overpayment once it has been identified.

Medicare Overpayment Rule: 2016 vs. 2025 Requirements

Under the original 2016 regulation, an overpayment was identified when the provider determined or should have determined through reasonable diligence that it had received an overpayment and had quantified the amount. The CY 2025 rule replaced that language with the “knowingly” standard used in the False Claims Act. An overpayment is now identified when the provider has actual knowledge of it or acts in deliberate ignorance or reckless disregard of it. CMS also removed the quantification requirement, so the 60-day period can begin before the exact amount is calculated.

Medicare Overpayment Investigations and Deadline Extensions

The revised regulation suspends the 60-day deadline while a practice conducts a timely, good-faith investigation to determine whether related overpayments exist. The suspension ends when the investigation concludes or 180 days after the initial overpayment was identified, whichever comes first.

This provision rewards practices that respond promptly. A practice that finds an error during an internal review and immediately investigates similar claims can report the full amount at once rather than submitting a series of separate refunds. A practice that delays the investigation, however, may lose the benefit of the suspension entirely. Structured reviews built on a medical billing audit checklist create the documented, prompt response the regulation expects.

Medicare Overpayment Reporting and Repayment Procedures

Most Medicare overpayments from physician practices are returned to the Medicare Administrative Contractor that processed the claims. MACs publish voluntary refund forms that require claim details, the reason for the refund and the calculation method, particularly when statistical sampling was used to estimate the amount. Where the MAC’s process permits, certain overpayments can also be returned through claim adjustments.

Larger findings can raise a different question. When an overpayment appears to involve potential fraud rather than an ordinary billing error, the OIG Provider Self-Disclosure Protocol may be the appropriate route. Practices in that situation should involve healthcare counsel before reporting. Practices that cannot return a large amount at once may also request an extended repayment schedule from their MAC under the hardship criteria in 42 CFR 401.607.

Understanding the Six-Year Medicare Overpayment Lookback

The regulation requires a practice to report and return an overpayment if it is identified within six years of the date the payment was received. That window means an audit finding in 2026 can reach claims paid as early as 2020. Where an error reflects a recurring pattern, such as a template that consistently supported a higher level of service than the note documented, the investigation should test whether the same issue affected earlier periods. That review is far simpler when a consistent coding audit schedule already exists.

Accurate coding remains the most effective protection against this exposure. Practices that rely on professional medical coding services reduce the documentation mismatches that most often lead to repayment years after a claim was paid.

Building an Effective Medicare Overpayment Compliance Process

The OIG General Compliance Program Guidance, published in November 2023, identifies auditing and monitoring as a core element of an effective compliance program. For the 60-day rule, that means assigning responsibility for overpayment review, recording the date each potential issue was first identified, documenting the scope and conclusion of every investigation and retaining confirmation of each refund.

Practices that already audit their own billing on a regular cycle can add these steps without building a separate program. The documentation itself becomes evidence of good faith if a payer, a MAC or the OIG later reviews how the practice responded.

Final Thoughts

The 60-day overpayment rule turns routine billing errors into compliance obligations once they are identified, which makes the response process as important as the error itself. Medlife MBS supports practices with coding reviews, documentation audits and claim corrections that surface overpayments early and document each investigation from start to finish. Through medical billing services built around accurate first-pass claims, Medlife MBS reduces the overpayments that lead to refunds and protects practices from the compliance risk of retaining them.

The post The Medicare 60-Day Overpayment Rule: What Practices Must Know appeared first on MedLifeMBS.

For practice owners and billing managers, the practical question is not how many codes changed but which of those changes touch the diagnoses their providers report every week. Two weeks into the new code year is the right moment to confirm that systems were updated correctly and to catch early denial patterns before they spread across a full month of claims. Practices that prefer to outsource this work often turn to specialist medical coding services.

The FY 2027 Code Set Took Effect on October 1, 2026

The CDC’s National Center for Health Statistics maintains ICD-10-CM, while CMS publishes the official code files, addenda and conversion tables on its ICD-10 webpage. The FY 2027 files were released in June 2026. The FY 2027 ICD-10-CM Official Guidelines for Coding and Reporting are now posted alongside them. The American Hospital Association will continue to publish clarifications through Coding Clinic as questions about the new codes arise.

Analyses that count new non-billable category headers place the total closer to 238 new entries, which explains why different sources report different figures. The ICD-10-PCS procedure code set also changed on the same date with 101 new codes, but those codes apply to inpatient hospital reporting rather than to physician office claims. This annual diagnosis update also arrives on a separate calendar from the January CPT release maintained by the AMA, a distinction covered in our overview of 2026 billing changes.

Deleted and Expanded Codes Create the Greatest Denial Risk

New codes rarely cause denials on their own because a practice can simply choose not to report them until documentation supports them. Deleted codes behave differently. When a code that previously stood alone becomes a non-billable header, any claim that still reports it is incomplete and will typically be rejected at the clearinghouse or denied by the payer. HIPAA transaction standards require the code set in effect on the date of service, so payers are under no obligation to accept a deleted code after October 1.

Because these errors originate in the code itself rather than in payer policy, they tend to appear in clusters. A single outdated superbill entry can affect every patient seen for that condition, which is why truncated codes are among the most common claim denial reasons in the weeks after an annual update.

Several Common Diagnoses Now Require Greater Specificity

The FY 2027 changes extend well beyond a single specialty. Obstetrics accounts for roughly a quarter of the new codes, while cardiology, musculoskeletal and endocrine chapters also received meaningful expansions. Changes that reach routine outpatient documentation include the following:

• Two new adult BMI codes, Z68.18 and Z68.19, which replace the former Z68.1
• New endocrine codes E89.830 and E89.838 for hypoglycemia following bariatric and other surgical procedures
• A new subcategory, M67.A, that gives plantar fasciitis and related plantar fascial conditions their own codes
• A restructured dilated cardiomyopathy category that requires a more specific code than I42.0 alone
• Expanded Z codes for personal history and exposure, including Z86.17 for a history of C. difficile infection

A coder cannot assign a more specific code than the documentation supports, so provider education on the affected conditions is as important as any software update.

Practice Systems Must Reflect the New Code Set

EHR vendors typically load the new code files automatically, yet favorites lists, custom templates and printed superbills are often maintained locally and remain unchanged until someone reviews them.

Superbills, Templates and Problem Lists

Practices should compare their most frequently reported diagnosis codes against the FY 2027 addendum and replace any code that was deleted or expanded. Problem lists deserve the same review, since a chronic condition entered years ago may now map to an invalid code that carries forward into every new encounter. Practices that rely on outside medical coding services can request this crosswalk review as part of the annual update rather than discovering gaps through denials.

Claim Scrubbers and Payer Edits

Claim scrubbing software must be loaded with the FY 2027 tables and set to validate codes against the date of service. A claim for a visit on September 30, 2026 still requires the FY 2026 code set even if it is submitted in October, so the scrubber needs both code years available during the transition. CMS can also release an April 1 update during the code year, as it did in 2026, which makes this date-of-service logic a permanent requirement rather than a one-time adjustment.

Post-Implementation Reviews Protect Fourth-Quarter Revenue

The first 30 to 60 days after October 1 reveal whether the transition was handled correctly. A focused review during October and November allows a practice to correct a handful of mapping errors before they affect hundreds of claims. An effective review should confirm the following:

• Rejections returned by the clearinghouse for invalid or truncated diagnosis codes
• Denials citing diagnosis inconsistency or a missing level of specificity
• Claims for September dates of service that were incorrectly coded with FY 2027 codes
• Provider documentation that does not support the new, more specific codes
• Payer-specific edits that adopted new codes on a different schedule

Patterns found during this review should be resolved at the source, whether that means correcting a template, retraining a provider or adjusting a scrubber rule. Practices that already track coding audit frequency can schedule a targeted audit of the most affected diagnosis categories within the first quarter of the code year.

Denied claims that result from the transition remain recoverable when they are corrected and resubmitted promptly. Dedicated denial management services can group these denials by root cause so that each correction also prevents the next occurrence.

Final Thoughts

Annual ICD-10-CM updates are predictable, yet each one introduces new opportunities for avoidable denials when systems and documentation lag behind the code set. Medlife MBS supports practices through each transition by reviewing high-volume diagnosis codes against the current addendum, updating claim edits and monitoring early denial trends so that revenue stays on schedule. Practices that want the full cycle handled from coding through payment can relying on medical billing services to keep every claim aligned with the FY 2027 requirements.

The post FY 2027 ICD-10-CM Updates: What Practices Need to Change Now appeared first on MedLifeMBS.

The risk appears when a claim is rejected, held for missing information or routed to the wrong payer, because the filing clock keeps running throughout each delay. For practice owners and billing managers, protecting revenue in 2026 depends on knowing each payer’s window and on building a process that tracks the time remaining on every open claim. Specialist accounts receivable management services can take much of this workload off an in-house team.

Timely Filing Limits Vary Widely Across Payer Types

No single national standard applies to every claim. Medicare’s limit is set by federal regulation, Medicaid limits are defined in each state’s provider manual and commercial limits are written into the participation agreement a practice signs with each plan.

State examples illustrate how much these windows differ. Texas Medicaid allows 95 days from the date of service, while California’s Medi-Cal program allows six months. A practice should also confirm the filing clause in each executed contract rather than relying on a general payer reference list.

Medicare Applies a Strict One-Year Rule With Narrow Exceptions

Section 6404 of the Affordable Care Act reduced the Medicare filing window to one calendar year from the date of service. CMS implements that rule through 42 CFR 424.44 and Chapter 1, Section 70 of the Medicare Claims Processing Manual. As of the eCFR text current through 2026, the regulation permits an extension only in limited circumstances. These include an error or misrepresentation by a Medicare contractor or CMS employee, retroactive Medicare entitlement, retroactive Medicare entitlement in which a state Medicaid agency recovers its earlier payment and retroactive disenrollment from a Medicare Advantage plan.

Each exception requires documentation. A Medicare Administrative Contractor will not extend the deadline simply because a claim was delayed internally. When a Medicare claim is denied for untimely filing, the balance generally cannot be transferred to the patient, which makes the loss a direct reduction in practice revenue.

Rejected Claims Do Not Stop the Filing Clock

Many practices assume that sending a claim before the deadline satisfies the requirement. Payers, however, measure timeliness by when they receive a claim they can process. A claim rejected as unprocessable at the clearinghouse or the payer front end is not considered filed, so the deadline continues to run until a corrected version is accepted.

This distinction matters when a payer later denies a claim for timely filing that the practice believes it submitted on time. In that situation, the appeal depends on dated evidence that the payer received and accepted the original submission. Acceptable proof typically includes the following:

• A clearinghouse acceptance report showing the payer received the claim
• An electronic claim acknowledgment confirming acceptance into the payer’s system
• A payer portal record displaying the original receipt date
• A remittance advice or letter that references the earlier claim

Corrected Claims and Appeals Follow Separate Deadlines

A payment determination does not end the timing obligations attached to a claim. Corrections and disputes each operate under their own windows, which often begin on a different date than the original filing limit.

Corrected and Replacement Claims

Many commercial payers require a corrected or replacement claim to be submitted within a defined period measured from the original remittance date. Medicare handles many minor clerical errors through a reopening process, which generally must be requested within one year of the initial determination.

Appeals After a Payer Determination

Appeals carry a separate set of deadlines. A Medicare redetermination must be requested within 120 days of receiving the initial determination, while commercial appeal windows are defined in each plan’s provider manual and frequently include a second appeal level with its own limit.

Credentialing and Eligibility Gaps Consume Filing Windows

Some of the most expensive timely filing losses begin before a claim is created. A provider who sees patients while enrollment is still pending may need to hold claims until the payer approves participation. Medicare permits limited retrospective billing for newly enrolled physicians, generally up to 30 days before the effective date, but commercial payers are often less flexible. Reliable medical credentialing services shorten that waiting period and reduce the number of claims held against a running deadline.

Coverage errors create a similar problem. When a claim is first sent to the wrong payer, the time spent waiting for that denial counts against the correct payer’s window. Accurate insurance eligibility verification before each visit confirms the active plan and payer order at the outset. Patients with more than one plan add another layer, since secondary payers often measure their deadline from the primary payer’s remittance, a sequence explained in our overview of coordination of benefits rules.

A Filing Calendar Turns Deadlines Into Daily Workload

Practices that rarely lose claims to timely filing treat each deadline as a scheduled task rather than as a reminder that appears only when a claim is nearly expired. A dependable process includes the following controls:

• A payer reference table listing initial, corrected claim and appeal deadlines for each contract
• Internal submission targets set well ahead of every payer limit
• Daily review of clearinghouse rejections so corrections are sent within one business day
• Aging reports sorted by days remaining in the filing window rather than by days since service
• Saved acceptance reports for every batch to support future appeals

The most effective protection remains a claim that is accepted on the first submission, which is why practices focused on submitting clean claims rarely face filing deadline disputes. When claims do stall, the underlying causes usually match the reasons for delayed payments found elsewhere in the revenue cycle.

Older balances require structured follow-up before their windows close. Professional accounts receivable management prioritizes open claims by remaining filing time and dollar value so that recoverable revenue is pursued while it can still be paid.

Final Thoughts

Timely filing limits are among the few billing rules that allow no recovery once a deadline passes, which makes prevention the only reliable strategy. Medlife MBS helps practices maintain payer-specific filing calendars, resolve rejections before deadlines approach and preserve proof of submission for every claim. With each deadline tracked from the date of service through final payment, Medlife MBS keeps earned revenue from expiring in the claim queue.

The post Timely Filing Limits by Payer and How Practices Protect Every Claim appeared first on MedLifeMBS.

The carc vs rarc distinction is important because each code serves a different purpose. Understanding both helps billing teams identify the reason for an adjustment, determine what needs to be corrected and understand why medical claims get denied. Reviewing the codes together also reduces repeated denials and helps practices identify patterns that may point to broader registration, coding or billing issues. For practices without the staff to manage this in-house, dedicated denial management services are one option.

What Is the Difference Between CARC and RARC Codes?

A Claim Adjustment Reason Code, or CARC, communicates the primary reason a payer is reimbursed less than the billed amount or issued no payment. A Remittance Advice Remark Code, or RARC, provides additional detail that the CARC does not include, often identifying the specific missing information or the action required to resolve the claim.

Remark codes fall into two categories. Most provide supplementary information about an adjustment, while a smaller group labelled as “Alert” codes communicates information only and does not require corrective action.

Both code sets are national standards under HIPAA, which means a specific code carries the same definition across participating payers. Both can appear on an electronic remittance advice, or ERA, as well as on paper explanations of benefits.

Why Are CARC vs RARC Codes Difficult to Interpret?

Several factors can make an otherwise routine remittance difficult to interpret correctly. The first is the group code, which is a two-letter prefix placed before the CARC to indicate who is financially responsible for the balance:

• CO: contractual obligation, generally written off by the practice
• PR: patient responsibility
• OA: other adjustments
• PI: payer-initiated reduction

Misreading the group code can result in a patient being billed for an amount that the payer contract does not allow the practice to collect. The second factor is that a single CARC may represent several different issues. CO-16 only confirms that required information is missing or invalid, which could involve a provider identifier, procedure code or authorization number. The accompanying RARC identifies which element requires correction. The third factor is the frequency of updates. Both code sets are revised several times each year, so older reference materials may contain modified, replaced or retired codes.

What Should a Practice Review on Every Remittance?

Which Elements of the Line Matter Most?

Following a consistent review sequence helps reduce interpretation errors on each remittance line:

• Group code: identifies who is responsible for the balance
• CARC: explains why the amount was adjusted
• RARC: specifies what requires correction or clarification
• Dollar amount: confirms the value associated with the adjustment

Reviewing the dollar amount first is a common mistake because the figure alone does not show whether the balance should be written off, billed to the patient or corrected and resubmitted.

Which Code Combinations Appear Most Often?

A relatively small group of combinations accounts for many remittances in outpatient practices:

• CO-45: the billed charge exceeds the contracted rate. This is typically a contractual adjustment rather than a denial.
• PR-1, PR-2 and PR-3: deductible, coinsurance and copayment amounts that are generally assigned to the patient.
• CO-16 with N290: the rendering provider identifier is missing or invalid and should be corrected before resubmission.
• CO-16 with M51: the procedure code is missing or invalid and should be corrected before resubmission.
• CO-97: The service is considered bundled into another reimbursed service, so modifiers in medical coding should be reviewed carefully before deciding whether an appeal is appropriate. 

The two CO-16 examples show why reviewing carc vs rarc codes together matters. The adjustment reason is identical in both cases, but the remark code identifies a different problem and therefore requires a different correction.

What Happens When These Codes Are Misinterpreted?

Interpretation errors rarely create one large financial loss. Instead, they gradually reduce collections across many claims. A CO-45 adjustment may be appealed even though no additional payment is due, a PR amount may be written off instead of billed to the patient and a CO-16 denial may be resubmitted without correction, leading to another denial. Timely filing requirements can make each error more costly. Payers set their own deadlines for corrected claims and appeals, and every unnecessary resubmission reduces the time available to meet those requirements.

Delayed resolution also allows balances to age, and older receivables are generally more difficult to collect. Effective Accounts Receivable management therefore depends on interpreting each remittance line correctly during the first review.

Why Do Billing Specialists Interpret These Codes More Efficiently?

Billing specialists who post payments regularly become familiar with code combinations that indicate a correctable error and those that are more likely to require an appeal supported by clinical documentation. They also recognise payer-specific patterns. Certain plans may pair CARC 96 with a remark referring to plan benefit provisions, which can indicate that the service falls outside the patient’s covered benefits.

Equally important, specialists monitor carc vs rarc billing codes over time. Repeated CO-16 denials carrying the same remark code often point to a recurring process issue in registration, coding or claim preparation rather than isolated errors. A periodic review to audit medical practice workflows can identify these trends before they affect a larger volume of claims.

How Medlife MBS Supports Practices

Medlife MBS reviews each remittance at the line level. Payments are posted, adjustments are categorised by group code and each denial is directed to the appropriate resolution pathway. Through its Denial Management services, carc vs rarc codes are recorded, grouped and traced back to their point of origin, whether the issue begins during registration, coding or payer adjudication. Correctable claims are revised and resubmitted, appeal-eligible claims are submitted with supporting documentation and ageing claims are followed up before filing deadlines expire.

For organisations looking to reduce the administrative burden of denial follow-up, we provides structured remittance management designed to shorten the reimbursement cycle, reduce repeated denials and protect practice revenue.

The post CARC vs RARC Codes: What’s the Difference? appeared first on MedLifeMBS.

Thorough insurance verification prevents most of these errors, yet dual coverage remains a persistent source of denials. Effective management depends on a clear understanding of coordination of benefits (COB), which often determines whether a practice receives payment within 30 days or waits closer to 90. Many practices now hand this work to insurance eligibility verification services so their staff can focus on patients.

How Does Coordination of Benefits Work? 

Coordination of benefits is the framework insurers use to determine the order of payment when a patient is covered by two or more health plans. The plan that pays first is the primary payer, the next is the secondary payer and some patients also hold a tertiary plan. The process ensures that combined payments do not exceed the total allowed charges. When a primary plan pays $150 toward a $200 visit, the secondary plan reviews the remaining $50. It may cover the full balance, a portion of it or none of it under its terms.

Dual coverage is more common than many practices anticipate, particularly among:

• Children enrolled under both parents’ plans
• Spouses who each maintain employer coverage
• Medicare beneficiaries who remain actively employed
• Patients enrolled in Medicaid alongside a private plan
• Patients receiving treatment for workplace or motor vehicle injuries

Why Coordination of Benefits Causes Billing Challenges 

Patients are often unaware of which plan is primary, and many assume the plan with broader benefits pays first. Coverage can also change without notice when a parent changes employers, a spouse retires or a patient becomes eligible for Medicare at 65.

Payment rules also vary by payer type. Commercial plans generally follow state regulations based on the NAIC Coordination of Benefits Model Regulation. Medicare follows federal Medicare Secondary Payer requirements, while Medicaid serves as the payer of last resort in nearly all cases. When COB information is incomplete or outdated, insurance companies deny claims or place them on hold until the issue is resolved. Many insurers also require members to complete an annual COB questionnaire, which can add further administrative pressure for practices with limited staff.

Which Coordination of Benefits Rules Determine the Primary Payer

Most coordination of benefits rules follow an established order of payment. The most common scenarios in outpatient practices are summarized as follows.

How the Birthday Rule Determines Primary Coverage 

When a dependent child is covered under both parents’ plans, the plan of the parent whose birthday occurs earlier in the calendar year is primary. Only the month and day are relevant. Where a court decree assigns responsibility for the child’s health coverage to one parent, that decree takes precedence over the birthday rule.

Two further rules apply to adult patients. A plan that covers an individual as an active employee pays before a plan that covers the same individual as a retiree or under COBRA continuation coverage. When no other rule applies, the plan that has covered the patient longest is primary.

When Medicare Becomes the Secondary Payer 

Under CMS Medicare Secondary Payer rules, a group health plan is primary for beneficiaries aged 65 and older who are actively employed by an organization with 20 or more employees. For beneficiaries entitled to Medicare on the basis of disability, the threshold increases to 100 employees. For end-stage renal disease, the group health plan remains primary during a 30-month coordination period.

What Happens When the Payer Order Is Incorrect

An incorrect payer sequence is typically identified through denial code CO-22. This code indicates that the service may be the responsibility of another payer under coordination of benefits. The claim must then be corrected and resubmitted.

Secondary payers apply their own timely filing limits, often calculated from the primary plan’s adjudication date. A missed deadline may result in a write-off. Incorrect sequencing can also produce overpayments that insurers later recover through offsets against future reimbursements. This places it among the leading reasons why insurers deny claims that appeared accurate at submission. Patients billed for balances they do not owe may also lose confidence in the practice.

How a Billing Specialist Manages Coordination of Benefits 

Accurate coordination of benefits requires every plan to be reviewed at every visit. Dedicated insurance eligibility verification services complete this review before the appointment, so coverage discrepancies can be resolved before a claim is created.

A qualified billing specialist will typically:

• Confirm all active coverage before each visit
• Request updated insurance information at check-in
• Review the payer’s records for current COB status
• Submit secondary claims with the primary plan’s EOB attached
• Monitor secondary filing deadlines independently

Final Thoughts

Practices are not expected to retain every payer rule, but they do require a consistent process for applying them. Medlife MBS incorporates coordination of benefits (COB) review into the front end of the revenue cycle. Each plan is verified, the payer order is established and outdated COB records are identified before submission.

When a CO-22 denial occurs, its denial management services correct the payer sequence and submit the claim to the appropriate payer. The secondary claim is then followed through to final payment, which reduces delays and protects practice revenue.

The post What Is Coordination of Benefits in Medical Billing? appeared first on MedLifeMBS.