Medicare Advantage plans deny prior authorization requests that would have been approved under traditional Medicare, and 82% of denials are overturned on appeal — but fewer than 1% of patients actually appeal

Medicare Advantage plans denied 3.2 million prior authorization requests in a single year. The HHS Office of Inspector General found that 13% of those denials were for services that met Medicare coverage rules — meaning those services would have been approved automatically under traditional Medicare. When patients or providers do appeal, 80.7% of denials are partially or fully overturned, which strongly suggests the initial denials were inappropriate. Yet fewer than 1% of denied claims are ever appealed. This matters because the math creates a perverse incentive. If a plan denies 1,000 claims and only 10 are appealed, even if all 10 appeals are overturned, the plan still avoided paying 990 claims. The OIG found that 18 of the 25 largest Medicare Advantage insurers had 'significant deficiencies' in their claims processing and appeals systems. For patients — predominantly elderly, often managing multiple chronic conditions — the appeals process requires filling out forms, gathering medical records, writing letters, and waiting weeks or months for a decision. Many patients simply give up, pay out of pocket, or go without the treatment. A patient denied a prior authorization for a necessary medication became septic, spent 39 days in the hospital, and then responded well to the medication — 70 days after it was originally prescribed. This problem persists because Medicare Advantage plans are paid a fixed capitated rate per enrollee, so every claim they deny is money saved. The penalties for inappropriate denials are weak — CMS conducts audits but rarely removes plans from the program. The appeals process places the burden entirely on the patient or provider, and the 80%+ overturn rate proves that the system functions as a friction-based cost control mechanism: deny first, pay only if the patient has the knowledge, resources, and persistence to fight back. Congress has not mandated automatic approval when denial rates or overturn rates exceed thresholds, so there is no structural feedback loop that punishes plans for systematic over-denial.