Medicare Advantage Insurers Use AI to Deny Care, Frequently Overturning Denials on Appeal
Medicare Advantage insurers, including major industry players like UnitedHealth Group and Humana, have faced scrutiny following findings that they denied rehabilitative care to older and disabled patients at higher rates than their peers. Federal investigators from the Office of Inspector General for the Health and Human Services Department discovered that when these denials were challenged, the insurers frequently overturned their own decisions, raising questions about the initial criteria used to block care.
Did You Know? Federal investigators found that when patients appealed denials for nursing home care, insurers overturned those decisions 97% of the time, suggesting the initial denials lacked sufficient justification.
How Insurers Use Artificial Intelligence to Manage Care
The investigation centers on the use of a UnitedHealth subsidiary, NaviHealth, which health plans hired to evaluate requests for rehabilitative services. NaviHealth employs artificial intelligence to analyze the care needs of Medicare Advantage members. This reliance on automated assessment tools has been a subject of ongoing concern, particularly regarding whether these systems accurately identify the medical necessity of care recommended by a patient’s own doctor.

Expert Insight: Samantha Carter notes that the high rate of overturned denials suggests a systemic breakdown in how care requests are screened. When an insurer reverses nearly every appeal, it indicates that the initial automated process may be prioritizing cost-cutting over clinical necessity, forcing vulnerable patients to navigate a burdensome appeals process to secure the care their physicians already authorized.
The Impact on Patients and Future Oversight
The pattern of denials and subsequent reversals reinforces long-standing concerns that major insurers may be profiting by placing barriers between patients and their prescribed treatments. Patients, particularly those who are seriously ill or injured, are often forced to fight for access to essential nursing home care. The reliance on NaviHealth’s AI-driven assessments has previously been linked to poor outcomes for patients, as documented in investigative reporting from 2023.
Moving forward, federal regulators may increase their scrutiny of the algorithms used by these companies. If the trend of near-universal reversals on appeal continues, it is likely that the Health and Human Services Department will face pressure to mandate stricter oversight of how third-party subsidiaries evaluate care requests. Stakeholders expect that these findings could lead to policy shifts aimed at ensuring that AI tools do not inappropriately restrict access to medically necessary services.
Frequently Asked Questions
What is the role of NaviHealth in the Medicare Advantage system?
NaviHealth is a UnitedHealth subsidiary hired by health plans to evaluate requests for rehabilitative care, using artificial intelligence to determine the care needs of patients.

How often do insurers overturn denials for nursing home care?
According to the Office of Inspector General for the Health and Human Services Department, insurers overturned their own denials for nursing home care 97% of the time following patient appeals.
Why are these findings significant for older patients?
The findings suggest that patients are being forced to fight for care recommended by their doctors, which raises concerns about whether insurers are prioritizing profit over the needs of seriously ill or injured adults.
Have you or a loved one ever had to appeal a decision regarding medical care coverage?