A physician group receives a Medicare overpayment demand for claims tied to a single physician, and the demand is addressed to the group, not the physician who rendered the care. That is the practical consequence of reassignment of Medicare benefits: under 42 CFR 424.80, an individual physician transfers the right to bill and be paid by Medicare to an employer or other enrolled entity, and every claim billed under that arrangement becomes, for payment purposes, the group's claim. The physician may have since left the practice. The exposure does not leave with them.
What Reassignment of Medicare Benefits Means
Medicare generally will not pay anyone other than the physician who personally furnished a covered service. Section 424.80 carves out limited exceptions, including one that lets a physician turn over the right to receive payment to an employer, group practice, or other enrolled entity, whether as a condition of employment or under a contractual billing arrangement. That transfer is documented through the CMS-855I enrollment application, which absorbed the former standalone CMS-855R form effective September 1, 2023, and it identifies the group's Medicare billing number under which the physician's National Provider Identifier will bill going forward. Once the reassignment is on file, claims for that physician's personally rendered services are billed, and paid, under the group.
Individual Liability Does Not Transfer With the Payment
Reassignment moves where the payment goes. It does not move who is clinically responsible for the service or the documentation behind it. The individual physician remains accountable for the medical judgment and the record supporting each claim, but Medicare's overpayment recovery runs against the entity that actually received the payment, which under a reassignment is the group. That produces a mismatch a group often does not appreciate until an audit letter arrives: the physician whose billing is at issue may have already left the practice, joined a competitor, or be uninvolved in the group's response, while the group remains the party Medicare looks to for repayment. Any dispute between the group and the physician over who should ultimately bear the cost is a separate contractual or indemnification question, unrelated to Medicare's right to recoup from whoever was paid.
How Reassignment Compounds Audit Exposure
When a Recovery Audit Contractor, known as a RAC, or a Unified Program Integrity Contractor reviews a sample of a physician's claims and finds a pattern of noncompliance with a local coverage determination or a documentation requirement, the contractor may apply extrapolation to project that error rate across the full universe of claims billed under the reassignment, not just the sample it reviewed, a methodology addressed in Challenging Extrapolation in Medicare Overpayment Demands. The resulting recoupment demand is issued to the group's Medicare billing number, and it can reach far beyond what the sampled claims alone would suggest. As explained in The Medicare Audit Process: Contractors, Stages, and Deadlines, the group is also working against contractor-driven appeal deadlines from the moment that demand arrives, which leaves little time to sort out internal responsibility before a response is due. A reassignment can also raise the group's own enrollment exposure: conduct connected to the reassigned billing can be examined during a subsequent revocation action, discussed further in Medicare Billing Privilege Revocations Under 42 CFR 424.535, and a revocation reaches the group's ability to bill Medicare at all, not only the individual physician's.
A reassignment moves the money. It does not move responsibility for reviewing what is billed under it, and a group that has not reviewed a reassigned physician's billing before an audit arrives is reviewing it for the first time under a repayment deadline.
Why Early Legal Counsel Is Critical
It is critical that physician groups promptly retain experienced healthcare defense counsel when an audit or overpayment demand touches claims billed under a reassignment arrangement. Early legal intervention can clarify which entity bears liability, protect the group's and the individual physician's rights, ensure appropriate responses to government requests, and preserve relevant defenses. Delaying legal representation can significantly affect the outcome of a matter and expose the provider to unnecessary risk.
How Health Law Alliance Can Help
Health Law Alliance has represented 2,500+ clients across Medicare audit and enforcement matters over 25+ years, including physician groups facing overpayment demands and revocation actions tied to a reassigned physician's billing. Our Medicare audit defense attorneys review reassignment and enrollment records, challenge extrapolated overpayment calculations, and represent both the group and, where appropriate, the individual physician through the audit and appeal process. Contact Health Law Alliance for a free, confidential consultation.
