Medicare Advantage Denied Millions of Prior Authorizations Last Year

A 72-year-old breaks her hip, spends four days in the hospital, and her doctor orders a transfer to a skilled nursing facility for rehab. Her Medicare Advantage plan says no. Her family scrambles, the hospital discharge planner shrugs, and she goes home without the rehab her surgeon recommended. This is the part of the Medicare Advantage tradeoff that does not show up in the premium comparison: the prior authorization.

If you are on Original Medicare with a Medigap supplement, this article is mostly background reading. Original Medicare rarely requires prior authorization for medically necessary care. Roughly half of Medicare beneficiaries are now in Medicare Advantage plans, and for them, the access friction baked into the plan design is the real cost, well beyond the $0 premium on the brochure.

The denial that almost no one appeals

The clearest recent data comes from a U.S. Department of Health and Human Services Office of Inspector General report released on June 8, 2026. The report examined prior authorization decisions across 19 Medicare Advantage organizations using data from June 2024. For skilled nursing facility requests, the overall denial rate was 12%, with individual insurers ranging from 0.4% to 23%. The three largest Medicare Advantage organizations by enrollment denied requests at higher rates than most of their peers.

A 12% denial rate by itself does not mean the denials were inappropriate. Plans are allowed to require documentation, and some requests legitimately fall outside coverage rules. The more revealing number is what happens when patients or providers challenge the decision.

Only 18% of skilled nursing facility denials were appealed. Of those appeals, insurers overturned 95% in the enrollee’s favor. Read that again. When a denial was challenged, the plan reversed itself in 19 out of 20 cases, often using the same criteria it had applied just days earlier. The pattern appeared in other post-acute settings as well. Appeals overturned 36% of long-term care hospital denials and 43% of inpatient rehabilitation denials, with rehab overturn rates ranging from 14% to 86% depending on the insurer.

An overturn rate that high, combined with such a low appeal rate, suggests that the friction itself may be part of the gatekeeping. Most denials remain in place because most patients never appeal. Discharge planners move on, families often do not realize they can challenge the decision, and patients either absorb the cost or go without the recommended care.

What this changes about the choice

Compare the structures honestly. Original Medicare plus a Medigap Plan G carries a higher monthly premium, but it generally offers broader provider access and fewer administrative hurdles. Medicare Part A covers the first 20 days in a skilled nursing facility at no cost after a qualifying three-day inpatient hospital stay, with daily coinsurance beginning on day 21. Once eligibility is established, the decision to admit is based on medical need rather than prior authorization from a private insurer.

A Medicare Advantage plan with a $0 premium and an in-network out-of-pocket maximum often looks cheaper on paper, and in a healthy year it frequently is. The calculation changes when rehab, chemotherapy, home health services, or specialized care become part of the picture. At that point, provider networks and prior authorization requirements become a larger part of the experience. The out-of-pocket maximum limits approved in-network cost sharing, but it does not guarantee that every requested service will be authorized, nor does it generally apply to Part D drug costs.

The switch back is the other trap. Moving from Original Medicare into a Medicare Advantage plan during open enrollment is relatively straightforward. Moving back to Original Medicare later often means applying for a Medigap policy under medical underwriting, where insurers in most states can deny coverage or charge higher premiums based on health history. A handful of states, including New York, Connecticut, Massachusetts, and Maine, provide broader guaranteed-issue protections, so it is important to check your state’s rules rather than assume the federal default applies.

What to do

If you are in a Medicare Advantage plan and receive a denial, appeal it. The plan has 30 days to respond to a standard pre-service appeal and 72 hours for an expedited one when a delay would jeopardize health. Ask the ordering physician to write a peer-to-peer letter citing medical necessity. If the plan upholds the denial, the appeal moves to an independent review entity outside the insurer.

If you are choosing between Advantage and Original Medicare for the first time, weight your decision by health trajectory rather than premium. A healthy 65-year-old with predictable needs has more room to take the Advantage bet. A 70-year-old with chronic conditions, frequent specialist visits, or a family history that points toward post-acute care should price out Original plus Plan G and treat the higher premium as insurance against the prior authorization process itself.

Re-shop your coverage every fall during open enrollment. Plans change networks, formularies, and prior authorization rules every January, and auto-renewal locks you into whatever the plan looks like next year, regardless of the one you signed up for.