Medicare Advantage overturned 95% of appealed prior auth denials: what the 2026 OIG reports mean for your practice
In June 2026, the HHS Office of Inspector General released two reports on how Medicare Advantage plans handle prior authorization for post-acute care. The headline finding: when patients appealed denials for skilled nursing facility admission, plans reversed 95% of them. Denial rates for long-term and inpatient rehab care ranged from 8% to 80% across insurers. The reports do not change what providers must do, but they confirm a pattern every operations leader already feels.
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The short version: In June 2026, the HHS Office of Inspector General released two reports on how Medicare Advantage plans handle prior authorization for post-acute care. The headline finding: when patients appealed denials for skilled nursing facility admission, plans reversed 95% of them. Denial rates for long-term and inpatient rehab care ranged from 8% to 80% across insurers. The reports do not change what providers must do, but they confirm a pattern every operations leader already feels: a large share of denials would not survive scrutiny, and the cost of proving it lands on your team. Below is what the reports found, what they do and do not mean, and the operational levers that reduce the burden.
What did the OIG find?
Two reports, released together, examined prior authorization for facility-based post-acute care among the 19 largest Medicare Advantage organizations, covering about 86% of national enrollment.
The first report, OEI-09-24-00331, looked at skilled nursing facility (SNF) admissions. In June 2024, these plans denied 12% of SNF admission requests, with rates spanning from 0.4% at one insurer to 23% at another. Patients and providers appealed about 18% of those denials. Of the appeals, plans overturned 95% in favor of the patient.
The companion report, OEI-09-24-00330, covered long-term acute care hospitals and inpatient rehabilitation facilities. An OIG official described denial rates running from 8% to 80% by company, a spread the agency called striking.
A few details sharpen the picture:
- Denials concentrated where the stakes were highest. Patients living in nursing homes were denied SNF-level care 40% of the time, nearly four times the 11% rate for other enrollees.
- A contractor drove much of the pattern. naviHealth, a UnitedHealth Group subsidiary, processed roughly half of all SNF requests and denied 14% of them, above the 11% rate for plans reviewing internally and the 9% rate for other contractors. When patients appealed naviHealth denials, plans reversed 97%.
- For-profit plans denied more. For-profit contracts denied SNF admission at 13%, compared with 8% for nonprofit contracts.
- Appeals take time patients do not have. The median wait from initial request to appeal decision was 6 days, and 17% of appeals took 10 days or longer, often while the patient sat in a hospital bed waiting for the next level of care.
Why does a 95% overturn rate matter for providers, not just patients?
The patient harm in these numbers is the headline, and it is real. But there is a second story underneath that operations leaders live every day: every overturned denial represents a fight that a provider had to wage and win.
Each of those appeals carried a cost. Someone gathered the documentation. Someone drafted the appeal. A clinician was pulled into a peer-to-peer review. The hospital often absorbed avoidable bed-days while the decision sat pending. When 95% of those fights end in reversal, the work was not protecting program integrity. It was friction, and providers paid for most of it.
This is the part of the prior authorization debate that gets lost. The policy conversation focuses on whether payers are denying inappropriately. The operational reality is that whether a denial is wrong or merely incomplete, your team still has to handle it. The volume is the burden.
Is it inappropriate denials or incomplete documentation?
This is the honest tension in the reports, and it is worth sitting with rather than spinning.
CMS, in its formal response, pushed back on the overturn rate as evidence of wrongdoing. The agency noted that a denial overturned on appeal may still have been warranted at first if it stemmed from documentation that was incomplete at submission and supplied later during the appeal. A KFF analyst made a similar point in press coverage: some rejections trace to provider-side issues such as missing clinical notes or incorrect codes, not payer behavior.
That same analyst then added the obvious caveat. Denial rates ranging from 8% to 80% across insurers reviewing comparable patients are hard to explain by documentation gaps alone. If paperwork were the whole story, the rates would cluster. They do not.
Both things can be true. Some denials are payer overreach. Some are documentation that should have been complete on the first pass. The operational conclusion holds in either case, and it is the one providers can act on:
The lever you control is first-pass completeness. You cannot fix a payer's incentives. You can make sure every submission goes out with the documentation the payer's criteria require, so the denials you do fight are the ones worth fighting, not the ones you handed the payer by leaving a field blank.
What does this mean for your prior auth operations?
The reports point at two distinct problems, and a provider can only act on one of them. You cannot change how a Medicare Advantage plan staffs its review queue or trains its contractor. You can change how complete and how fast your own submissions and appeals are.
Here is where the numbers translate into operations:
| OIG finding (June 2026) | Operational implication for providers |
|---|---|
| 95% of appealed SNF denials overturned | Most denied cases are winnable, but only if someone appeals. Capacity to appeal is the constraint. |
| naviHealth denied at 14%, overturned at 97% | Contractor-reviewed payers generate appeal volume. Know which of your payers route to which contractor. |
| Median 6 days to an appeal decision | Every day in appeal is a day of delayed care and, for hospitals, avoidable cost. Speed of submission compounds. |
| 8% to 80% denial range across insurers | Payer mix drives your denial workload. The same procedure carries very different odds by plan. |
Source: HHS OIG reports OEI-09-24-00331 and OEI-09-24-00330, June 2026.
The practices that handle this well treat prior authorization as one workflow to automate end to end, not a pile of denials to fight one at a time. They close the documentation gap before submission so first-pass approval climbs, and they let automation carry the routine follow-up and resubmission so the cases that need a clinician's judgment get one and the rest resolve without burning coordinator hours.
That is the design behind Linear Health's prior authorization automation. It runs the majority of the workload, from submission through status tracking to resubmission, and routes only the complex cases to your team. The prevention side is covered in the 10 most common denial reasons, and the follow-through in our guide on denial management.
"Linear Health runs our entire referral workflow. It reads faxes, extracts data, creates charts, verifies insurance, schedules patients, and closes referrals automatically. Only the complex cases reach our staff. Everything else just works."
Anuradha Jairam, Director of Operations, Vancouver Sleep Center
What role should automation play here?
Automation is already part of this story. Some of the reviews the OIG examined were processed with the help of AI on the payer side, which has made many providers wary of the word. The distinction worth holding is what the technology is pointed at. Used to score and deny requests, automation adds friction between a patient and covered care. Used on the provider side to assemble complete submissions and carry the routine follow-up, it removes that friction and gives clinical teams their time back for the cases that need judgment. Linear Health operates only on the provider side, and only on operations. It does not make coverage or medical-necessity decisions.
Where automation helps, and where it does not
Honest scope, because it controls how this gets used:
Strong fit. Specialty practices, primary care groups, FQHCs, and PE-backed networks carrying high prior authorization and referral volume, where coordinator hours are the bottleneck and denial-and-appeal workload is growing. If your team spends 15-plus hours a week in payer portals, the math is straightforward.
Less ideal fit. Organizations looking for a tool to adjudicate clinical appropriateness, or patients seeking help appealing their own denials. Linear Health automates provider operations, not clinical judgment and not the patient-side appeal. For broader patient-protection questions raised by these reports, the appropriate channels are CMS oversight and the appeals process itself.
Where regulation is heading is a tailwind for the operational case. In June 2025, major insurers pledged to cut the volume of services subject to prior authorization and to deliver real-time approvals for most requests by 2027, alongside standardized electronic submission. The CMS Interoperability and Prior Authorization Final Rule already sets faster decision timelines and requires specific denial reasons. We cover what changed and when in the prior authorization cheat sheet and how to speed up prior authorization for specialists. The direction is clear: less manual PA, faster decisions, more transparency. Practices built to submit complete and move fast are the ones positioned for it.
Frequently asked questions
What did the 2026 OIG prior authorization reports find?
Two HHS Office of Inspector General reports released in June 2026 examined Medicare Advantage prior authorization for post-acute care. Plans overturned 95% of appealed denials for skilled nursing facility admission, denied SNF requests at 12% overall, and showed denial rates for long-term and inpatient rehab care ranging from 8% to 80% across insurers.
Why is a 95% appeal overturn rate a concern?
A reversal rate that high suggests many initial denials were for care the plan ultimately agreed was medically necessary. It indicates the first decision was often wrong, and that patients and providers had to file an appeal to access covered care, adding delay and administrative burden.
Does prior authorization automation make coverage decisions?
No. Provider-side prior authorization automation like Linear Health handles operational work: submitting requests with complete documentation, tracking status, and assembling appeals. It does not determine medical necessity or make coverage decisions, which remain with payers and clinicians.
How does automating prior authorization reduce denials?
Most preventable denials come from incomplete documentation or payer-specific formatting errors at submission. Automation validates each submission against the payer's requirements before it goes out, which raises first-pass approval rates and shrinks the appeal queue.
Which payers and contractors were named in the reports?
The reports named the three largest Medicare Advantage organizations (UnitedHealth Group, Humana, and CVS Health) as receiving the most SNF requests and denying at some of the highest rates, and identified the UnitedHealth subsidiary naviHealth as denying at a higher rate than internal review or other contractors.
Sources and references
- HHS Office of Inspector General, Medicare Advantage Organizations Overturned Nearly All Appealed Prior Authorization Denials for Skilled Nursing Facility Admission, OEI-09-24-00331, June 2026.
- HHS Office of Inspector General, companion report on long-term acute care and inpatient rehabilitation, OEI-09-24-00330, June 2026.
- HHS, HHS Secretary Kennedy, CMS Administrator Oz Secure Industry Pledge to Fix Broken Prior Authorization System, press release, June 23, 2025.
- CMS Interoperability and Prior Authorization Final Rule (CMS-0057-F).
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