Medicare contractors use the Additional Documentation Request (ADR) to pull the medical record behind a claim before deciding whether it survives review. A Medicare Administrative Contractor (MAC), Recovery Audit Contractor (RAC), Unified Program Integrity Contractor (UPIC), or Supplemental Medical Review Contractor (SMRC) can issue one, and the response window is short: 45 calendar days for most contractors, only 30 for a UPIC. A late or incomplete response does not just slow the review. It becomes a denial, an overpayment demand, and often the opening move of a larger post-payment audit.
Who Sends an ADR and Why
MACs issue ADRs during both prepayment and post-payment medical review, typically when a claim trips a service-specific edit or a targeted probe. RACs and UPICs pull claims post-payment based on data analysis that flags billing patterns rather than a single claim. Every ADR tests the same question: does the medical record support the claim as billed, including medical necessity under the applicable local coverage determination? For how each contractor fits into the broader audit sequence, see The Medicare Audit Process: Contractors, Stages, and Deadlines.
The 45-Day and 30-Day Clock
The response clock starts on the date printed on the ADR letter, not the date your practice opens the mail. The standard deadline is 45 calendar days under 42 CFR 405.903 for prepayment review and 42 CFR 405.929 for post-payment review. A UPIC request compresses that to 30 calendar days under the same two provisions. Contractors may grant a good cause extension for a natural disaster, a business closure, or another documented extenuating circumstance, but the request has to reach the contractor before the deadline passes. Silence past the deadline is treated the same as no response at all.
What a Complete Package Contains
A package that survives review does more than answer the letter. It includes the signed physician order or certification for the service, progress notes tied to the specific date of service billed, and documentation showing the service met the applicable coverage determination. Add a cover sheet with a point of contact, the ADR control number, and an index of enclosures. A reviewer who cannot locate the note supporting a line item denies that line item, and the full chart is not a substitute for the pages that answer the exact criteria being tested.
A missed or incomplete ADR response does not cost one claim. It hands the contractor a denial it can extrapolate across the full audit sample and the underlying lookback period.
The Cost of Missing the Deadline
When the deadline passes without a response, the contractor denies the claim as not reasonable and necessary, citing sections 1815(a), 1833(e), and 1862(a)(1)(A) of the Social Security Act, and the denial converts into an overpayment recoupment action. On a MAC or RAC audit built from a statistical sample, a run of non-response denials can become the basis for extrapolating the error rate across the lookback period, turning a handful of missing records into a six- or seven-figure demand. The claim can still be appealed, but a redetermination filed after the fact is a harder case than a complete response filed on time.
Why Early Legal Counsel Is Critical
It is critical that healthcare providers promptly retain experienced healthcare defense counsel upon receiving an ADR, an audit notice, or any other government inquiry. Early legal intervention can protect the provider's rights, ensure appropriate responses to the contractor's requests, avoid inadvertent admissions, and preserve relevant defenses. Delaying legal representation can significantly affect the outcome of a matter, particularly when a documentation gap could be read as a billing pattern rather than an isolated error.
How Health Law Alliance Can Help
Health Law Alliance represents providers at every stage of the Medicare audit process, from the first ADR through appeal and, where warranted, an extrapolation challenge. If your practice has received a Medicare ADR or a broader audit notice, contact us for a free, confidential consultation.
