CPT modifier 25 allows a physician to bill an evaluation and management (E/M) visit on the same day as a procedure when the E/M service is significant and separately identifiable from the procedure itself. Medicare contractors treat modifier 25 as a high-risk billing pattern, and claims carrying the modifier are subject to targeted review by RAC, CERT, and SMRC contractors. A finding of misuse on even a small claim sample can support a recoupment demand that reaches back years once extrapolation is applied. This article explains when modifier 25 use is defensible, the documentation patterns that draw payer scrutiny, and how a modifier 25 audit typically proceeds.
Background
The American Medical Association describes modifier 25 as permitting a procedure and an E/M service to be distinctly different but required for the patient's condition to be reported and paid separately, according to the AMA's guidance on proper modifier 25 use. The AMA frames the standard as three questions: did the physician document a problem-focused evaluation, could that work stand alone as a billable service, and did it exceed the usual pre- and post-procedure work already bundled into the procedure code.
CMS's National Correct Coding Initiative (NCCI) Policy Manual reinforces this standard for minor surgical procedures: the E/M service must be unrelated to the decision to perform the procedure, and the record must clearly separate the E/M documentation from the procedure note. A local coverage determination issued by the Medicare Administrative Contractor may add further documentation specifications for particular procedure and E/M code pairs.
Common Misuse Patterns That Draw Scrutiny
HHS-OIG has scrutinized modifier 25 billing for two decades. A 2005 OIG review of modifier 25 use found that 35 percent of sampled claims using the modifier did not meet Medicare program requirements, contributing to an estimated $538 million in improper payments for that year alone.
The pattern has not resolved. A May 2025 OIG report on E/M services billed alongside eye injections reviewed 24 sampled claims and found that 22 of the 24 had documentation that did not support modifier 25. OIG found that providers billed an accompanying E/M service with modifier 25 for 42 percent of the intravitreal injections examined, and it recommended CMS recover up to $123.96 million in overpayments. The recurring deficiency in both reports: the procedure note and the E/M note are combined into a single entry, with no distinct assessment and plan for a separate problem.
Auditors also flag statistical outliers: a practice that appends modifier 25 to a disproportionate share of procedure claims, relative to specialty peers, is more likely to be selected for a probe sample. Copy-forward E/M notes that repeat the same boilerplate language across visits are a frequent finding in denial letters, since they lack the patient-specific detail needed to show a genuinely separate encounter.
A modifier 25 audit turns on what the medical record documents: a genuinely separate, medically necessary evaluation and management service distinct from the procedure itself.
How a Modifier 25 Audit Unfolds
A modifier 25 audit typically begins with a records request from a RAC, SMRC, or CERT contractor covering a defined claim sample. If the contractor determines the E/M documentation does not support separate billing, it issues a demand letter reclassifying the claim as an overpayment. Because probe samples are small, an adverse finding can trigger extrapolation, under which the error rate in the sample is projected across the full universe of the practice's modifier 25 claims for the audit period, converting a handful of disputed visits into a much larger recoupment demand. A physician who receives such a demand has appeal rights through Medicare's five-level administrative process, and the strength of that appeal depends heavily on documentation the physician assembles at the outset.
Why Early Legal Counsel Is Critical
It is critical that physicians promptly retain healthcare defense counsel upon receiving a subpoena, audit notice, records request, or other government inquiry tied to modifier 25 billing. Early legal intervention can protect the physician's rights, ensure appropriate responses to contractor requests, avoid inadvertent admissions, preserve relevant defenses, and allow counsel to communicate with auditors on the physician's behalf. Delaying legal representation can significantly affect the outcome of a matter and expose the physician to unnecessary risk, including an extrapolated recoupment demand that a timely response could have narrowed or avoided.
How Health Law Alliance Can Help
Health Law Alliance represents physicians and practices in Medicare and Medicaid audits, including matters where modifier 25 billing is the focus of a contractor's review. The firm has handled 2,000+ audits across federal and state programs, work that includes evaluating documentation against payer standards, responding to demand letters, and pursuing appeals when recoupment determinations are unsupported. Physicians facing a modifier 25 audit or a related records request may contact Health Law Alliance's Medicare audit defense team for a free, confidential consultation.
