Key Takeaway: Medicare Advantage plans denied roughly 4.1 million prior-authorization requests in 2024, but only 11.5% of those denials were appealed. When appealed, insurers reversed about 80.7% of denials. Beneficiaries should file appeals within the typical 65-day window (or request expedited review when health is at risk) and have clinicians document medical necessity to maximize reversal chances.
Medicare Advantage Denied 4.1M Prior Authorizations in 2024 — Appeals Reversed 81% of the Time
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Medicare Advantage (MA) plans denied about 4.1 million prior-authorization requests in 2024 — and nearly nine in 10 of those denials were never appealed. When beneficiaries or their clinicians did challenge a decision, insurers reversed roughly 80.7% of the denials, making appeals a powerful but underused remedy.
What Happened
A Kaiser Family Foundation analysis counted 52.8 million prior-authorization determinations by MA insurers in 2024 (about 1.7 requests per enrollee). Plans fully or partially denied 4.1 million requests, a 7.7% denial rate. Only 11.5% of those denials were appealed; when appealed, insurers overturned 80.7% of the initial denials.
By comparison, Original (Traditional) Medicare handled roughly 625,000 prior-authorization reviews in 2024 and denied about 22.9% of them. These figures are not directly comparable: Original Medicare requires prior authorization for a much narrower set of services, while MA plans apply prior authorization far more broadly.
A Patient Example
Imagine a 72-year-old woman discharged after a five-day hospital stay for a fall. Her surgeon recommends rehabilitation at a skilled nursing facility (SNF), but her MA plan denies coverage as "not medically necessary." She generally has about 65 days to file a standard appeal or can request an expedited review if waiting could jeopardize recovery. If she does neither, she may pay out of pocket, leave care early, or accept a lower level of care than prescribed.
Why Appeals Succeed
High reversal rates do not necessarily mean plans were careless. Many successful appeals succeed because clinicians add clinical notes, submit missing documentation, or clarify the medical rationale. Still, for patients awaiting care, the practical outcome is the same: an appeal often changes a denial into approval.
Financial Tradeoffs To Consider
The cost picture remains important when comparing Original Medicare and Medicare Advantage. In 2026 the standard Part B premium is $202.90. Under Original Medicare, beneficiaries typically face a $283 Part B deductible, roughly 20% coinsurance for Part B services, a $1,736 Part A hospital deductible per benefit period, and a $217 daily charge for SNF care from days 21 through 100.
A Medigap Plan G carries an additional monthly premium but generally covers most cost sharing after the Part B deductible. MA plans may have lower premiums and annual out-of-pocket caps for in-network services but impose network limits and broader prior-authorization controls. Choosing between them is a tradeoff between predictable cost sharing and insurer control over when care qualifies as covered.
Thinking Of Switching From MA To Original Medicare?
An MA enrollee can return to Original Medicare during eligible enrollment periods. But buying Medigap to pair with Original Medicare can be harder: outside the six-month Medigap open-enrollment window or other guaranteed-issue protections, insurers in most states can use medical underwriting. A recent hospitalization or newly documented condition may affect acceptance or premiums. Confirm state protections and obtain written Medigap approval before ending an MA plan.
Practical Steps To Improve Your Chances If Denied
- Appeal Promptly. File a standard appeal within the typical ~65-day window. If delay could seriously jeopardize health, request an expedited review (usually decided within about 72 hours).
- Document Medical Necessity. Ask the ordering clinician to submit clinical notes that explain why the requested service is necessary and why a lower level of care would be inadequate.
- Compare Plans Carefully. Review a plan’s prior-authorization requirements and reported authorization metrics and weigh them against a Medigap quote and your state’s underwriting rules before enrolling.
A denial notice is the plan’s first answer — not necessarily the last. The most effective appeals replenish the medical record with the treating clinician’s rationale while there is still time for the care to affect recovery.
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