CPT codes 99213 and 99214 are among the most commonly billed office visit codes under Medicare Part B. While the difference between them may seem small, choosing the wrong code can have a significant financial impact over time. Undercoding can lead to lost revenue, while overcoding increases the risk of payer audits and claim reviews. Accurate coding requires clear documentation that supports the visit level based on medical decision-making or total time spent on the date of the encounter.
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.
| MDM Element | 99213 (Low) | 99214 (Moderate) |
|---|---|---|
| Problems addressed | Two or more self-limited problems, one stable chronic illness or one acute uncomplicated illness | One chronic illness with exacerbation or progression, two or more stable chronic illnesses or one undiagnosed new problem with uncertain prognosis |
| Data reviewed | Limited: two items such as external notes, unique test results or tests ordered | Moderate: three data items, independent interpretation of a test or discussion with an external physician |
| Risk of management | Low risk, such as over-the-counter drug management | Moderate risk, such as prescription drug management |
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.
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TALK TO AN EXPERTG2211 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.