Medicare pays only for services that are reasonable and necessary for the diagnosis or treatment of a patient's condition. When a Medicare Administrative Contractor or a Recovery Audit Contractor decides the record does not establish that standard, the result is a denial, and frequently a recoupment demand reaching back across the full audit lookback period. The dispute turns on whether the chart, read months or years later, proves the service was justified on the date it was rendered, not on whether the treatment actually helped the patient.
The Reasonable and Necessary Standard
The legal basis for a medical necessity denial traces to a single provision. Section 1862(a)(1)(A) of the Social Security Act bars payment for items and services that are not reasonable and necessary for the diagnosis or treatment of illness or injury, a standard codified at 42 CFR 411.15(k). CMS proposed a fixed regulatory definition of the term in January 2021 and repealed it in November 2021, leaving the standard to be applied case by case through the agency's Medicare Program Integrity Manual and through coverage policy rather than a single bright-line test. That leaves the clinical record itself, not a checklist, as the primary evidence a reviewer weighs.
Local Coverage Determinations Set The Specific Criteria
Where a Local Coverage Determination exists, it fills the gap the statute leaves open. Each Medicare Administrative Contractor publishes LCDs defining the diagnoses, clinical indicators, and supporting documentation a given service requires within its jurisdiction, searchable through the CMS Medicare Coverage Database. A physician who orders a service without confirming the LCD in effect for that contractor risks a denial even when the clinical judgment was sound, because the reviewer checks the file against the LCD's specific criteria rather than general medical reasonableness. When no LCD or National Coverage Determination addresses the service, the reviewer applies the statutory reasonable and necessary standard directly, which raises the value of a well-documented clinical rationale even further.
Documentation Auditors Actually Test
The Medicare Program Integrity Manual requires that services be documented in the record at the time they are rendered, and that any amendment, correction, or delayed entry distinctly identify the original content, the change, and the date and author of the change. Every entry needs a signature, handwritten or a compliant electronic signature. An order missing a signature is disregarded during review, while other unsigned entries can sometimes be rescued with a signed attestation from the author. None of that substitutes for substance. Reviewers are looking for a contemporaneous narrative connecting the patient's diagnosis, history, and clinical findings to the specific service billed, not a template note repeated across visits.
A signature proves who wrote the note. It does not prove the service was medically necessary. That proof has to be in the substance of the note itself.
Why Early Legal Counsel Is Critical
A physician who receives an additional documentation request, a prepayment review notice, or a post-payment denial letter benefits from retaining experienced healthcare defense counsel before responding. A single denied sample claim can become the basis for extrapolation across the full audit period, turning one contested chart into a six or seven figure recoupment demand. A RAC finding and a Medicare Administrative Contractor finding proceed through the same five levels of Medicare overpayment appeals, but a missed deadline at any level can forfeit the right to challenge the finding at all. Delaying legal representation narrows the options available by the time a case reaches an administrative law judge.
How Health Law Alliance Can Help
Health Law Alliance represents physicians and practices in medical necessity denials, additional documentation requests, and the recoupment and extrapolation disputes that follow, as part of the firm's Medicare audit defense practice. If a Medicare Administrative Contractor or Recovery Audit Contractor has denied claims for lack of medical necessity, contact us for a free, confidential consultation.
