Medicare RAC Audit Overpayment Redetermination Appeal

The situation

Dr. Patricia Chen runs a 3-physician internal medicine practice in suburban Dallas. In March 2026, she received a certified letter from Cotiviti (the Southwest Region RAC contractor) demanding repayment of $47,350 across 94 claims over the past 3 years, citing "insufficient documentation to support the level of E&M service billed", the practice consistently billed 99214 and 99215 for complex patient visits that Cotiviti's automated review concluded were only 99213-level. She has never received a RAC demand before. She doesn't know: (a) the 30-day threshold, she has 120 days to file a formal appeal, but if she doesn't file a Redetermination within 30 days, Medicare will begin recouping the $47,350 by withholding her future Medicare payments while interest accrues; (b) the Level 1 Redetermination is a straightforward administrative process, she files form CMS-20027 to her Medicare Administrative Contractor (Novitas in Texas), attaches a cover letter asserting that documentation supports the E&M level billed, and includes the specific clinical record documentation for each disputed claim; (c) the documentation she needs is already in her EHR, the key is knowing what to compile: time documentation if time-based billing was used, or an MDM (Medical Decision-Making) worksheet showing the complexity of each visit's documentation, diagnosis, and treatment decision if MDM-based billing was used; (d) the RAC's automated review flagged 99214/99215 claims but didn't review the actual clinical record, a manual record review often reveals that the documentation DOES support the billed level; (e) at the ALJ hearing level (Level 3), RAC findings are overturned 40-50% of the time, the appeal process has significant expected value for a $47,350 demand; (f) a healthcare defense attorney quoted her $8,500 for the Level 1 and Level 2 appeal process.

Who receives this

Solo and small-group physicians (1-5 physicians) in Medicare-participating practices who receive their first RAC overpayment demand letter. Primary: internal medicine, family medicine, and primary care physicians receiving E&M coding audits ($25,000-$150,000 demand range), the most common RAC audit type. Secondary: orthopedic surgeons receiving medical necessity audits for post-acute care, and hospitalists receiving discharge status/DRG audits. The tool is NOT suitable for: hospital systems (have compliance teams), practices receiving fraud and abuse referrals (need defense attorneys from day one), or practices with prior overpayment history (heightened enforcement context).

Why the agency will not advise you

CMS and the RAC contractors audit providers and cannot build "how to appeal our audit findings" tools for respondents. Medicare Administrative Contractors (MACs, the regional claims processors) publish basic guidance on the redetermination process but no structured appeal builder. Healthcare defense attorney firms (HCH Lawyers, Oberheiden P.C., Rosenblat Law) charge $5,000–$20,000 per RAC matter and are not incentivized to build a $149 self-serve tool. RCM blog posts from simbo.ai, arrowhq.com, and medicalbillersandcoders.com describe the process but are editorial content with no interactive product. The 30-day recoupment threshold creates urgency that a tool can capture, physicians who don't know about it face immediate cash flow impact.

Key facts, with sources

• Medicare Recovery Audit Contractors (RACs) are CMS-contracted auditors who identify and collect Medicare overpayments on a contingency fee basis (RAC keeps a percentage of what they recover). The four Medicare RAC contractors cover all geographic regions: Cotiviti (Regions 1 and 5), Performant Recovery (Region 2), Conduent (Region 3), and HMS (Region 4). RAC auditors look back 3 years of claims for overpayments. In 2023, RAC audits collected approximately $1.1 billion in Medicare overpayments from providers. CMS is scaling its medical coder workforce from 40 to 2,000 by September 2025, indicating intensified RAC activity in 2025-2026. Providers have 120 days from the demand letter to file a Level 1 Redetermination; however, providers who file within 30 days of receipt avoid Medicare recoupment (the automatic withholding of future Medicare payments). Filing after 30 days means recoupment begins, this distinction is critical and widely misunderstood by small practices. Source: How do I Appeal an Overpayment Finding Resulting From a RAC Audit? — American College of Cardiology
• The five-level Medicare appeals process provides multiple opportunities to challenge RAC findings. Level 1 (Redetermination) has a 60-day processing deadline; Level 2 (QIC Reconsideration) has a 60-day processing deadline with a 180-day filing deadline; Level 3 (ALJ Hearing) requires an amount in controversy ≥$190 (2025 threshold). RAC audit findings are overturned at the ALJ level approximately 40-50% of the time, meaning a significant proportion of RAC overpayment demands are successfully appealed, but only practices that file timely appeals capture this outcome. Most small practices either pay the demand immediately (accepting a loss) or hire healthcare defense attorneys ($5,000-$20,000) without knowing that the Level 1 Redetermination process is a standard administrative form-based process they could navigate themselves. The RAC audit landscape is expected to intensify significantly in 2025-2026 as CMS scales its medical coder workforce 50-fold. Source: A Comprehensive Guide to the RAC Audit Appeal Process — Simbo AI Blog
• Small medical practices (1-5 physicians) are disproportionately vulnerable to RAC audit demands because: (1) they often handle their own medical billing or use basic billing services that lack RAC appeal expertise; (2) they are less likely to have compliance officers or healthcare defense attorneys on retainer; (3) the financial impact of a $25,000-$150,000 RAC demand is more severe relative to practice revenue; (4) RAC contractors target the highest-density claim patterns, E&M upcoding, medical necessity failures, and discharge status errors, which are disproportionately concentrated in primary care and internal medicine practices that bill high volumes of outpatient visits. Approximately 250,000 physicians participate in Medicare; the majority practice in groups of fewer than 10 physicians, with approximately 120,000 in solo or small-group settings. Source: The RAC Audit Landscape for 2025 and Beyond — blueBriX Health

When to bring in a professional

Self-serve responses fit routine cases: clear facts, amounts a business can absorb, and a deadline still ahead of you. Bring in a licensed professional when the amount at stake is large relative to their fee, the facts are genuinely disputed, criminal exposure is possible, or the deadline has already passed. A short paid consultation to sanity-check your plan is often worth it even when you handle the filing yourself.

All sources for this guide

1. How do I Appeal an Overpayment Finding Resulting From a RAC Audit? — American College of Cardiology
2. A Comprehensive Guide to the RAC Audit Appeal Process — Simbo AI Blog
3. The RAC Audit Landscape for 2025 and Beyond — blueBriX Health