Why Internal Medicine Practices Are Losing Revenue Through E/M Downcoding
For many Internal Medicine practices, the biggest revenue leak is not a dramatic payer denial. It is the quieter problem of E/M downcoding: visits billed below the level supported by the work performed, or claims reduced after submission without a strong appeal process. Under current office/outpatient rules, visit levels are based on medical decision-making or total time, not old-style history and exam bullet counting. Source: CMS Source
The revenue impact is bigger in 2026
This is not a small compliance issue. CMS says the improper payment rate for all E/M codes was 10.3% in the latest Medicare fee-for-service supplemental data, representing a projected $3.9 billion. Even more telling, incorrect coding accounted for 49.1% of those improper payments, while insufficient documentation accounted for 34.1%. That means revenue loss is often tied directly to coding accuracy and note support, not just payer behavior. Source
The financial stakes are even sharper in 2026 because CMS finalized payment updates that increase physician conversion factors and recognized greater indirect costs for office-based settings. In plain English, correct coding matters more when every office visit is being measured against tighter labor costs, staffing pressure, and payer scrutiny. Source
Why Internal Medicine visits get downcoded
Chronic care often looks simple when the note undersells the work
Adult primary care is full of encounters that seem routine at first glance but are not low-complexity in reality. Two stable chronic illnesses, medication management, diagnostic review, or progression of an existing condition can move a visit into moderate medical decision making. When the note reads like a quick follow-up instead of documenting the actual complexity, revenue drops before the claim even leaves the practice. Source
Old E/M habits still drive new-chart decisions
A surprising number of teams still code as if a long history and exhaustive physical exam determine the visit level. They do not. CMS and AAFP guidance make clear that office/outpatient E/M levels are selected by MDM or total time. History and exam still need to be medically appropriate, but they no longer drive the level selection. Practices that have not fully retrained clinicians and coders often default to conservative coding, especially on established-patient visits. Source Source
99213 vs 99214 is where the money is usually lost
The most expensive confusion point is the gap between 99213 and 99214. AAFP notes that 99213 generally reflects low-complexity MDM, such as one stable chronic illness or an acute uncomplicated problem. By contrast, 99214 commonly fits two stable chronic illnesses, a chronic illness with exacerbation or progression, an undiagnosed new problem with uncertain prognosis, or prescription drug management with moderate risk. When clinicians treat moderate work as “just a follow-up,” undercoding becomes habitual. Source
Time gets spent, but not captured
A visit may also support a higher level based on total physician or qualified practitioner time on the date of service. For 99214, AAFP highlights a 30-39 minute range for established patients. That can include chart review, medication reconciliation, counseling, ordering tests, documentation, and care coordination completed on the same day. If that time is real but never documented, the practice has done the work without billing for it. Source Source
Payer downcoding can quietly erode clean claims
Not all downcoding starts inside the practice. The AMA warns that payer E/M downcoding programs can significantly reduce physician practice revenue, especially when they become routine or when a provider is placed under broader review. The same AMA resource says these programs also create administrative burden because teams must spend time identifying reductions and appealing them. If remittance advice is not reviewed closely, reduced payment becomes normalized. Source
What the numbers say about missed revenue
Published research shows this is not theoretical. A systematic review of outpatient billing practices found that 55% of assessed notes in one internal medicine resident setting were underbilled, with an average loss of $45.26 per encounter. The same review also cited estimated annual revenue loss of $57,569.85 for the average residency in one sample and showed that training and feedback interventions materially improved billed levels. Source
Another peer-reviewed analysis estimated that undercoding in Florida primary care could cost roughly $113.9 million per year, with about 2.6 million of 29.34 million visits projected to be undercoded. The authors also noted that some physician practices may sacrifice as much as $100,000 annually through undercoding. While that model is statewide, the lesson is practical: a small coding gap repeated across thousands of follow-up visits becomes a major revenue drain. Source
Most Internal Medicine groups do not lose this money because they ignore compliance. They lose it because workflow, training, documentation, and remittance review are not aligned tightly enough to the way E/M rules actually work in 2026. That is why revenue leakage often hides inside otherwise busy, seemingly productive schedules. Source
A practical 2026 snapshot
| Metric | What it means for practices |
| 10.3% E/M improper payment rate | E/M remains a high-risk, high-impact coding area |
| $3.9 billion projected improper payments | Small documentation mistakes scale into major reimbursement loss |
| 49.1% tied to incorrect coding | Training and auditing have direct financial upside |
| 34.1% tied to insufficient documentation | Even correct clinical thinking must be supported in the note |
| 5%-10% denial-rate benchmark | Higher rates suggest front-end or coding process weakness |
| 95%+ clean-claim benchmark | Clean claim performance helps protect revenue before AR ages |
How to stop revenue leakage from E/M downcoding
Audit the high-risk visit patterns first
Start with established-patient office visits, especially the 99213-to-99214 border. Review by provider, payer, diagnosis mix, and documentation style. If one clinician consistently codes below peer norms, that is not automatically wrong, but it is worth investigating. CMS maintains E/M utilization reporting by specialty precisely because benchmarking helps practices spot outliers before they become systemic revenue problems. Source
Train clinicians on MDM and time, not myth
The best retraining is specialty-specific. Use real charts involving hypertension, diabetes, CKD, hyperlipidemia, anticoagulation, polypharmacy, medication adjustments, and chronic disease monitoring. Show exactly why a visit qualifies at a certain level. This is where specialized Internal Medicine Medical Billing Services can make a measurable difference, because generic coding education often misses the nuances of adult chronic-care encounters.
Review remits for silent payer reductions
The AMA recommends vigilant review of remittance advice because some payers may reduce payment in ways that are easy to miss operationally. Practices should also work with their systems or billing partners to flag denial codes, pattern changes, and repeated one-level reductions. If you do not measure payer downcoding, you will not appeal it, and if you do not appeal it, you are training the payer to keep doing it. Source
Build feedback loops around note support
Coders should not function as a cleanup team after the fact. The better model is fast, targeted feedback: what was missing, what supported the higher level, what time elements were not captured, and which phrases weakened medical necessity. The outpatient literature consistently shows that education plus feedback improves coding accuracy and billed levels. Source
Track the right revenue-cycle KPIs
If downcoding is hurting the practice, the symptom may show up in more than one place. Monitor coding accuracy, clean-claim rate, denial rate, net collection rate, and AR aging. A broader revenue-cycle review found that physician practices should aim for coding accuracy above 95%, a clean-claim rate of at least 95%, denial rates in the 5%-10% range, and no more than 15% of AR over 90 days. Those numbers give leadership a practical dashboard for catching revenue leakage early. Source
Final Thoughts
E/M downcoding is rarely just a coder problem. It is usually the combined effect of conservative provider habits, outdated E/M assumptions, incomplete time capture, weak documentation support, and missed payer reductions. The good news is that it is one of the most fixable sources of lost revenue because the root causes are measurable, trainable, and auditable.
