Medicare Advantage plans rejected roughly one in 13 requests for prior authorization of care in 2024, according to contract-level data collected by the Centers for Medicare and Medicaid Services. Federal audits have repeatedly found that some of those denials blocked care that actually met Medicare coverage rules, and that plans reversed nearly all denials when beneficiaries appealed. With new transparency requirements set to take effect in 2026 and 2027, the pressure on insurers to clean up their approval processes is about to intensify.
Denial rates, appeals reversals, and what they mean for beneficiaries
The CMS Parts C and D Reporting Requirements Limited Data Set provides contract-level counts of prior authorization requests and denials submitted by every Medicare Advantage organization. Those figures show that plans denied about 7.7 percent of all prior authorization requests in 2024, a rate that translates to approximately one denial for every 13 requests. For certain types of care, the numbers run higher. A separate HHS Office of Inspector General examination focused on skilled nursing facility admissions found that reviewed MAOs collectively denied 12 percent of SNF admission requests in June 2024, and that nearly all of those denials were overturned once beneficiaries or providers filed appeals.
That pattern of deny-then-reverse raises a direct question about the quality of initial decisions. When a plan denies a request that it later approves on appeal, the beneficiary still absorbs the cost of delay: postponed treatment, additional paperwork, and the stress of fighting for care already judged medically appropriate. An earlier OIG audit reached a similar conclusion, finding that a subset of sampled MA prior authorization denials met Medicare coverage rules but were still rejected, raising concerns about access to medically necessary care.
For beneficiaries, these statistics are not abstract. A denial can mean staying in the hospital longer than necessary while waiting for a skilled nursing facility bed, missing a rehabilitation window after surgery, or going without diagnostic tests that could clarify a new condition. Even when an appeal ultimately succeeds, families may have already rearranged caregiving schedules, paid out of pocket for interim services, or seen a loved one’s health worsen during the delay.
Appeals data also highlight an imbalance of power and information. Many older adults and caregivers lack the time, health literacy, or support to navigate multi-step appeals. If nearly all appealed denials are overturned, yet only a fraction of beneficiaries appeal, then a significant share of improper denials may never be corrected. The result is uneven access to medically necessary care that depends as much on a person’s persistence and resources as on clinical need.
How CMS rule changes are tightening the screws on plan behavior
CMS has responded to these findings with a series of regulatory actions. The 2024 Medicare Advantage and Part D Final Rule, designated CMS-4201-F, tightened coverage criteria and continuity-of-care requirements for contract year 2024. In its official fact sheet, the agency explains that plans must align prior authorization decisions more closely with traditional Medicare coverage policies and limit the use of proprietary clinical criteria that could narrow access.
The same rule also strengthens protections for people who are already in the middle of treatment. For example, when beneficiaries switch plans or move between care settings, Medicare Advantage organizations are expected to maintain coverage for ongoing courses of treatment for a defined period, rather than forcing providers to restart the prior authorization process from scratch. CMS drew directly on OIG findings, including report OEI-09-18-00260, to justify these guardrails around how plans apply internal rules when reviewing requests.
A second, forward-looking regulation will push plans further. The CMS Interoperability and Prior Authorization Final Rule, designated CMS-0057-F, requires Medicare Advantage organizations and other impacted payers to implement standardized application programming interfaces and to publicly report prior authorization metrics. Major compliance deadlines extend into 2026 and 2027. Once those deadlines arrive, plan-level denial rates, processing times, and approval patterns will be visible not only to regulators, but also to clinicians, consumer advocates, and competing insurers.
This data-sharing mandate could reshape incentives in several ways. Public reporting may deter overly aggressive denial practices by exposing outlier plans whose rejection or delay rates significantly exceed those of their peers. Providers will gain clearer expectations about how long it takes particular plans to respond, helping them plan discharges and schedule treatments more reliably. Beneficiaries and counselors who assist with plan selection will have more concrete information to weigh when comparing options during open enrollment.
At the same time, interoperability requirements are intended to reduce administrative friction. Standardized electronic prior authorization tools should make it easier for clinicians to submit complete requests, track status updates, and respond quickly to additional documentation demands. If implemented effectively, these changes could shorten decision timelines and reduce the number of denials driven by missing information rather than true coverage issues.
Whether these reforms will fully resolve concerns raised by OIG remains uncertain. Plans retain financial incentives to manage utilization, and the complexity of Medicare coverage rules leaves room for disagreement over what is “medically necessary.” Yet the combination of clearer standards, continuity-of-care protections, and public performance metrics marks a shift toward closer oversight.
For beneficiaries, the stakes are straightforward: fewer inappropriate denials, faster decisions, and more predictable access to covered services. As the 2026 and 2027 transparency deadlines approach, how insurers adapt their prior authorization practices will be a key test of whether regulation can align cost control with timely, medically appropriate care for the people Medicare Advantage is supposed to serve.
Free for readers: The free Retirement Shield newsletter sends plain-English help keeping more of your money in retirement — the scams to dodge, the benefits you’re owed, and what’s changing with Social Security and Medicare, a couple times a week. Get the free newsletter.
Warren Cohen is a finance writer based in Phoenix, Arizona, covering personal finance topics including credit, banking, and beginner investing. He earned his degree in business administration from Arizona State University and began his career working in consumer finance, where he gained direct experience with lending and credit systems. He now writes for personal finance websites and fintech platforms, focusing on clear, practical content that helps readers make informed financial decisions.
