Medicare Advantage Risk Adjustment Data Validation audits are how CMS checks whether the diagnoses a Medicare Advantage plan submitted for a patient are actually supported by the medical record. Physicians do not sign the risk adjustment submission, but the chart notes behind it are the record RADV reviewers pull first, and an unsupported Hierarchical Condition Category can trigger recoupment against the plan, termination from a value-based network, and, where a provider shared in the risk-adjusted revenue, a False Claims Act referral of the provider's own conduct.
How RADV Chart Review Validates HCC Coding
CMS selects a sample of enrollees from a Medicare Advantage contract, typically 35 to 200 records depending on plan size, and requests the medical records supporting every diagnosis used to calculate each enrollee's risk score. Under CMS's Medical Record Reviewer Guidance, a diagnosis counts only if the record reflects a face-to-face encounter with a qualified provider, is legibly signed and dated within the payment year, and comes from an acceptable provider or record type. A Hierarchical Condition Category with a missing signature, an undated visit, or a diagnosis the encounter note does not support is disallowed, and the disallowance flows into the audit's error rate. RADV runs on a separate track from the contractor-driven claims reviews described in Health Law Alliance's overview of the Medicare audit process, but the records-production burden on the practice looks much the same.
Extrapolation and the Current State of CMS Recoveries
CMS finalized its extrapolation methodology in a February 2023 final rule, effective April 3, 2023, applying statistical extrapolation to RADV findings beginning with payment year 2018 and eliminating the Fee-for-Service Adjuster that had previously offset recoveries, a combination that turns a sample-level error rate into a contract-wide repayment demand. A federal court vacated that rule on September 25, 2025 on procedural grounds, and CMS filed a notice of appeal on November 1, 2025, leaving extrapolated recoveries unsettled while the underlying audits continue.
The litigation has not slowed the audit pipeline. In a May 2025 announcement, CMS said it would move from auditing about 60 Medicare Advantage plans a year to all eligible contracts, roughly 550 plans annually, and would expand its medical coder team from 40 to 2,000 by September 2025 to work through the backlog of payment years 2018 through 2024. CMS cited its completed audits of payment years 2011 through 2013, which found overpayment rates of 5 to 8 percent, and federal estimates that Medicare Advantage plans overbill the program by as much as $17 billion a year, with the Medicare Payment Advisory Commission putting the figure as high as $43 billion.
Provider-Side Exposure Beyond the Health Plan
CMS audits the Medicare Advantage organization's contract, not the individual physician, but the records request that starts an RADV sample review lands on the practice that treated the patient. Inadequate documentation can support the health plan's contractual recoupment against a provider whose coding or attestation produced the flagged diagnosis. Providers in a value-based or risk-sharing arrangement carry an added layer of exposure. Coding practices that inflate a plan's risk-adjusted revenue while the provider shares in that revenue, unsupported add-on diagnoses, and post-encounter addenda that introduce a new Hierarchical Condition Category after the visit are the conduct patterns that convert an RADV finding into independent False Claims Act exposure for the provider, not just a repayment obligation for the plan.
A records request addressed to the health plan can still end as a False Claims Act referral against the provider who signed the chart.
Why Early Legal Counsel Is Critical
It is critical that physicians and practices promptly retain experienced healthcare defense counsel upon receiving a Medicare Advantage RADV records request or a health plan's risk adjustment documentation inquiry. Early legal intervention can protect the provider's rights, guide what is produced and how documentation gaps are addressed, avoid inadvertent admissions in a response letter or a coding correction, and preserve defenses available before a plan's recoupment or a False Claims Act referral is finalized. Delaying counsel until after the plan has already attributed the finding to the practice can significantly affect the outcome, a distinction covered further in When to Engage a Medicare Audit Attorney.
How Health Law Alliance Can Help
Health Law Alliance defends physicians and practices facing Medicare Advantage risk adjustment scrutiny, from an initial RADV-related records request through any plan-level recoupment or False Claims Act inquiry that follows. The firm's bench includes a former federal prosecutor and a former senior executive at a national health insurer, background that shapes how we read what a health plan or the government is building toward from a chart request. If your practice has received an RADV audit notice or a health plan's risk adjustment documentation request, contact our Medicare audit defense team for a free, confidential consultation.
