Revenue problems in pulmonology practices rarely start in the exam room. They start in the billing department, quietly and consistently and most practices do not notice until the numbers look off at the end of the quarter.
A denied claim here. An underpayment there. A resubmission that takes three weeks and still comes back rejected. Each feels like a minor inconvenience. Together they represent revenue the practice earned and never collected.
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TALK TO AN EXPERTWhy Pulmonology Billing Gets Complicated
Most specialties have a predictable mix of procedures. Pulmonology is more layered than that.
The conditions being treated, including COPD, asthma, interstitial lung disease, lung cancer and pulmonary hypertension, carry overlapping diagnoses that need to be coded with a level of specificity most general billing teams are not used to working with. Pulmonary function testing, bronchoscopy, thoracentesis, lung biopsy and pulmonary rehabilitation all carry distinct CPT requirements, documentation standards and payer-specific rules that vary depending on how and when the service was delivered.
Pulmonology also sits directly in the path of regulatory change. ICD-10 updates, Medicare guideline shifts and payer policy revisions mean that a claim submitted correctly last year may not meet current requirements. Prior authorization challenges add another layer, particularly for advanced imaging and infusion-based treatments where approval requirements vary significantly across payers. Practices that are not tracking these changes end up submitting outdated claims without realizing it.
Where Pulmonology Revenue Gets Lost
Diagnosis Codes That Are Too Vague
ICD-10 coding in pulmonology needs to be specific, not just technically valid. Take COPD as an example. J44.9 is the unspecified code. But if the documentation reflects a specific severity level or an associated complication, a more precise code exists and should be used. Submitting J44.9 when the chart supports a more detailed code is how claims get flagged for additional documentation or denied on medical necessity grounds.
The diagnosis code on the claim should match exactly what the chart shows, covering what the patient presented with, what was found and what was treated. Anything less creates a record that does not accurately reflect the care delivered.
Procedure Codes That Miss the Full Picture
Pulmonology CPT codes carry more nuance than they appear to. Spirometry is not simply CPT 94010 across the board. Whether additional testing was performed in the same session, what the clinical findings were and how the test was conducted all affect how the claim should be structured.
Common codes that need to be applied correctly every time:
- CPT 94010 for spirometry
- CPT 31622 for flexible bronchoscopy with biopsy
- CPT 94625 and 94624 for pulmonary rehabilitation
Each requires supporting documentation that directly matches the code and has modifier considerations that affect reimbursement. Getting them right consistently requires someone working in pulmonology regularly, not someone applying general medical billing logic to a specialty they handle occasionally. Procedure coding also depends on how the visit is documented, which is why medical coding and clinical documentation need to stay aligned.
Modifiers That Get Skipped
This is where consistent revenue losses occur without triggering a denial.
Modifier 25 applies when a significant evaluation and management service is provided on the same day as a procedure. It is frequently skipped, either because the biller is unfamiliar with when it applies or because the documentation does not make it clear. Modifier 59 identifies separately identifiable procedural services within the same encounter and gets missed regularly when multiple services are delivered in a single visit.
Skipping either means the practice gets reimbursed for part of what was delivered, with no denial to flag the shortfall.
What Billing Gaps Do to a Practice Over Time
The financial impact builds gradually. Denial rates increase. Days in accounts receivable stretch past acceptable thresholds. Staff hours that should go toward new claim submissions get absorbed by rework and appeals. As coding patterns become inconsistent, payer audit exposure increases as well.
There is also a clinical dimension worth noting. When procedure and diagnosis codes do not accurately reflect the visit, the patient record becomes less reliable across providers and care settings. That affects continuity of care in ways that extend beyond the billing cycle.
For pulmonology practices dealing with recurring billing gaps, Medlife MBS provides pulmonology billing services built around the specific coding and documentation demands of respiratory care.