Federal investigators report that major Medicare Advantage plans are systematically denying post-acute rehabilitation care, with many decisions later overturned upon appeal.
A series of federal investigations has pulled back the curtain on the gatekeeping practices of Medicare Advantage (MA) plans, revealing a systemic pattern of care denials that threatens the recovery of American seniors and undermines the doctor-patient relationship. Reports from the Department of Health and Human Services Office of Inspector General (OIG) indicate that the nation’s largest private insurers are frequently blocking access to long-term care hospitals and inpatient rehabilitation facilities, often in direct contradiction to Medicare’s own coverage rules.
The data is startling for those who value individual liberty and clinical autonomy over corporate bureaucracy. The OIG found that the three largest MA insurers deny nearly two-thirds of requests for admission to long-term care hospitals and more than half of requests for inpatient rehab stays. At CVS/Aetna, the prior authorization denial rate for long-term care hospitals reached as high as 80%, while Humana and UnitedHealth followed closely at 72% and 71%, respectively. These figures suggest that the very entities entrusted to manage taxpayer-funded benefits are instead creating a bottleneck for the most vulnerable patients.
These denials appear to be a feature, not a bug, of the current private-plan design. While insurers argue that prior authorization is a tool for fiscal responsibility and clinical appropriateness, the appeal success rates suggest a different reality. In cases involving NaviHealth, a rehab-management contractor used by major plans like UnitedHealth and Humana, a staggering 97% of nursing-home denials were overturned when patients or their families had the resources and persistence to appeal. Overall, more than 80% of appealed denials for skilled nursing facilities are at least partially overturned, yet only 11.5% of denials are ever challenged. This suggests that the vast majority of seniors simply accept a denial, unaware that the decision likely violates federal standards.
The impact on patient outcomes is measurable and concerning. In 2024, Medicare Advantage enrollees were approximately 7 percentage points less likely than those in traditional Medicare to utilize institutional post-acute care after a hospital stay. This disparity raises serious questions about whether seniors are being steered away from necessary high-intensity rehab settings simply to bolster insurance company margins. For people already living in nursing homes, the situation is even more dire; denial rates for these individuals reach roughly 40%, despite the fact that 80% to 97% of these cases are successful upon appeal.
Market dynamics are shifting toward even more centralized gatekeeping, further distancing the patient from their care team. Blue Cross Blue Shield of Michigan recently notified providers that it will centralize prior authorization for post-acute services through independent third-party vendors. This trend suggests that the administrative hurdles between a doctor’s recommendation and a patient’s treatment are only growing taller, as insurers increasingly rely on third-party algorithms to dictate medical necessity.
While the Centers for Medicare & Medicaid Services (CMS) is moving to update payment rates and social-determinant assessments for traditional Medicare—including a 3.0% rate increase for FY 2025—the private market continues to lean heavily on algorithmic denials. A 2025 U.S. Senate Permanent Subcommittee on Investigations report, titled “Refusal of Recovery,” documented how these practices jeopardize financial stability and physical recovery. For the American senior, the promise of Medicare Advantage often comes with a hidden cost: a loss of autonomy and a high-stakes battle for the care they were promised. True transparency and market competition cannot exist when the rules of the game are hidden behind proprietary insurance algorithms.

