Medicare Advantage Coverage Algorithms: The Algorithm Can Help, the Patient's Chart Decides

A Medicare Advantage plan's algorithm may inform a coverage decision, but since 2024 the patient's own chart has to make it, and most denials are never appealed. Medicare Advantage plans use computer models to predict how long a patient will need care, and a federal rule since January 2024 says that prediction cannot be the reason care stops. The rule, CMS-4201-F, makes a plan decide whether a service is medically necessary from the patient's own history, the doctor's recommendation and the clinical notes, and it requires a physician with the right expertise to review any denial based on medical necessity. A February 2024 memo from CMS applied that to algorithms: a tool may help, a predicted length of stay cannot end services by itself, and plans should check their tools for bias. The line was drawn after reporting on nH Predict, a naviHealth tool used by UnitedHealthcare, and a lawsuit over a 91-year-old man whose nursing-home therapy was cut off after 19 days. A Senate investigation found UnitedHealthcare's post-acute denial rate rose from 8.7% in 2019 to 22.7% in 2022. Federal reviews in 2026 found plans denied 12% of requests to enter a skilled nursing facility and overturned 95% of the denials that were appealed, yet only 18% were appealed at all. Enforcement has been thin: the proposed AI guardrails were dropped, no published audit tests the core requirement, and a House bill would make a physician attest that AI did not dictate a denial. From 2026 every denial must carry a specific reason, and a new model brings AI-assisted prior authorization to Traditional Medicare in six states. For patients and families the practical step is to ask for the reason and appeal. MARA, the Collective's medical assistant in design, follows the same line: the software recommends, a person decides, and the record shows which one did. Article ART-HLC-023. Originally published at https://www.maxresearchcollective.com/articles/medicare-advantage-coverage-algorithms.html