Medicare Advantage Rehab Denials: What Rehabilitation Providers Need to Know About Prior Authorization and Appeals

Introduction

If you work in rehabilitation, whether that's a hospital-based inpatient rehab unit, a skilled nursing facility, or an outpatient PT, OT, or SLP practice managing referrals for post-acute care, you've probably felt for years that Medicare Advantage plans deny rehab admissions at rates that don't match the clinical picture in front of you. In June 2026, the HHS Office of Inspector General put hard numbers behind that feeling.

Two OIG reports released that month looked specifically at how the largest Medicare Advantage organizations handle prior authorization for post-acute care, skilled nursing facility admissions in one report, and long-term acute care hospital and inpatient rehabilitation facility admissions in the other. The findings were stark. Some of the biggest plans in the country denied inpatient rehab requests at rates as high as 66 percent, and long-term acute care requests at rates as high as 80 percent. Then, when patients actually appealed, a large share of those denials got reversed, sometimes at rates approaching 100 percent for individual plans.

This isn't a generic prior authorization complaint piece. It's a real, documented reimbursement problem with a paper trail from the federal government's own watchdog, and it has direct implications for how rehab providers should be building prior authorization requests and structuring appeals right now. This article walks through what the OIG actually found, why so many of these denials don't survive appeal, and what that means for your documentation and appeal strategy going forward.

What the June 2026 HHS OIG Reports Actually Found

The OIG released two related reports on June 11, 2026, both examining Medicare Advantage organizations' use of prior authorization for post-acute care following a hospital stay.

The skilled nursing facility report

The first report, covering SNF admissions, reviewed prior authorization data from 19 of the largest Medicare Advantage organizations, together covering 29.3 million enrollees, roughly 86 percent of total MA enrollment at the time. In June 2024, these plans collectively denied 12 percent of SNF admission requests, with individual plan denial rates ranging widely from 0.4 percent to 23 percent. For-profit plans denied at a noticeably higher rate, 13 percent, than non-profit plans, at 8 percent.

Here's the part that should catch your attention. Only 18 percent of denied SNF requests were actually appealed. But of those that were appealed, 95 percent were overturned. One plan overturned 99.7 percent of the SNF appeals it received. The OIG was direct about what this means: each overturned denial represents a case where a patient or provider had to file an appeal just to access care that was medically necessary and already covered under Medicare rules.

The long-term care hospital and inpatient rehabilitation report

The second report examined roughly 3,200 long-term acute care hospital requests and 19,400 inpatient rehabilitation facility requests across the same group of 19 plans. The results were even more pronounced. Overall, MA plans denied 54 percent of IRF admission requests and 65 percent of LTCH admission requests in June 2024.

The three largest MA organizations, UnitedHealthcare, Humana, and CVS Health, denied these requests at some of the highest rates among all 19 plans reviewed:

1. UnitedHealthcare denied 66 percent of IRF requests
2. Humana denied 54 percent of IRF requests
3. Aetna denied 51 percent of IRF requests
4. The remaining plans in the review averaged 41 percent
5. CVS Health denied 80 percent of LTCH requests
6. Highmark Health denied more than 70 percent of LTCH requests
7. Molina had the highest IRF denial rate among smaller plans, at 64 percent

When patients appealed, MA plans collectively overturned 36 percent of LTCH denials and 43 percent of IRF denials. Individual plan overturn rates for IRF denials ranged from 14 percent all the way up to 86 percent. Only about a third of denied LTCH and IRF requests were actually appealed, meaning a substantial number of denials that likely would have been overturned were simply never challenged.

What the OIG concluded

The OIG's language in both reports was pointed. High overturn rates, the agency wrote, raise concerns that some enrollees were initially denied medically necessary care, and that MA organizations denying care inappropriately are not delivering the value taxpayers pay them to provide. OIG recommended CMS begin regularly collecting request-level prior authorization data, including service type and contractor information, and investigate the wide variation in denial and overturn rates across plans and contractors. As of the report's release, CMS had not explicitly concurred or non-concurred with either recommendation.

Why This Matters for PT, OT, SLP, and Rehab Facilities

These numbers aren't abstract. They translate directly into operational and financial strain across the entire rehab continuum.

Every denied request that gets appealed and overturned represents a patient whose recovery was delayed for no clinical reason, staff time spent assembling records and filing an appeal instead of coordinating care, and, on the hospital side, an acute care bed occupied by a patient who no longer needs acute-level care but can't yet be discharged to the appropriate rehab setting. For outpatient PT, OT, and SLP practices downstream, a denied or delayed IRF or SNF stay can mean patients arrive for outpatient therapy later, weaker, and with a more complicated recovery trajectory than they would have had with timely post-acute rehab.

And because only about a third of LTCH and IRF denials, and less than a fifth of SNF denials, actually get appealed, a meaningful number of patients are likely accepting inappropriate denials without ever pushing back, simply because the appeal process itself is a burden nobody has time for.

How This Differs From Original Medicare

This distinction matters more than most providers realize, and it's worth being precise about it.

Original Medicare does not use prior authorization for inpatient rehabilitation facility or skilled nursing facility admissions the way Medicare Advantage plans do. Instead, Original Medicare's gatekeeping is structural. The clearest example is the three-day qualifying inpatient hospital stay requirement, which must generally be met before Original Medicare will cover a SNF stay. There's no discretionary, case-by-case administrative denial layered on top of that structural rule.

Medicare Advantage plans, by contrast, are permitted to waive that three-day rule, and many do, but they replace it with prior authorization requirements that give the plan case-by-case discretion over whether to approve the admission at all. That's a fundamentally different kind of barrier, and it's the mechanism the OIG reports are specifically scrutinizing. Understanding which type of barrier you're dealing with, a fixed rule versus a discretionary review, should shape how your team approaches the request from the start.

The Role of Third-Party Review Contractors

One of the more striking findings buried in the SNF report deserves its own attention. A significant share of SNF prior authorization denials weren't made directly by the MA plan's own internal team. They were made by third-party contractors working on the plan's behalf.

NaviHealth, a UnitedHealth subsidiary, processed roughly half of all SNF prior authorization requests industry-wide and denied 14 percent of them, a higher rate than MAO internal teams (11 percent) or other contractors (9 percent). Here's the part that raises real questions about oversight: when patients appealed naviHealth's denials, the MA organizations themselves overturned those denials 97 percent of the time. That's not the plan being overruled by an external body. That's the plan reversing its own contractor's decision on appeal, in nearly every single case where an appeal was filed.

The OIG explicitly flagged this as a training and oversight concern, since CMS holds MA organizations responsible for their contractors' compliance with Medicare rules. For rehab providers, the practical takeaway is that a denial issued by a delegated review contractor may be more vulnerable to reversal on appeal than one issued by the plan's own internal reviewers, which is worth factoring into how aggressively you pursue an appeal.

Common Reasons Rehab Prior Authorization Requests Get Denied

While the OIG reports don't break down denial reasons claim by claim, patterns from clinical documentation and appeal outcomes across the industry point to a consistent set of recurring issues.

1. Insufficient documentation of functional status and rehabilitation potential. IRF admissions specifically require documentation supporting that the patient can reasonably be expected to actively participate in and benefit from an intensive rehabilitation program.
2. Missing or incomplete physician certification. IRF coverage requires a physician's pre-admission screening and certification supporting the need for the intensive rehabilitation setting, and gaps here are a common, avoidable denial trigger.
3. Inadequate justification for the intensity of therapy required. IRF coverage generally requires that the patient be able to tolerate and benefit from an intensive therapy program, commonly referenced as needing at least three hours of therapy a day, five days a week, or an equivalent 15 hours over a seven-day period. Documentation that doesn't clearly establish this can lead to a denial in favor of a lower level of care.
4. Level-of-care mismatches. A request that doesn't clearly distinguish why a patient needs IRF-level care rather than SNF-level care, or vice versa, gives a reviewer an easy basis for denial.
5. Missing comorbidity or medical complexity documentation that would support the need for the more intensive setting being requested.

The Appeals Process: What Rehab Providers Need to Know

Given how often these denials get overturned, understanding the appeal mechanics is genuinely one of the highest-leverage things a rehab provider can do.

1. File promptly. The median time from an initial denial to an appeal decision in cases the OIG reviewed was around six days, so speed matters, particularly for patients still occupying an acute care bed awaiting a decision.
2. Use the expedited process when appropriate. A fast-track appeal process through the Beneficiary and Family Centered Care Quality Improvement Organization, or BFCC-QIO, exists specifically for discharge-related disputes and can keep coverage running while the appeal is being decided, rather than forcing a treatment gap.
3. Request a peer-to-peer review before filing a formal appeal when possible, since this can sometimes resolve a denial faster than the formal appeals track, particularly when the initial denial came from a delegated contractor rather than the plan's own clinical team.
4. Assemble complete clinical documentation before appealing, not just a resubmission of the original request, since the appeal is your opportunity to directly address whatever gap the denial cited.
5. Don't assume a denial is final. Given that 43 percent of IRF denials and 95 percent of SNF denials were overturned on appeal in the OIG's data, a denial should be treated as a starting point for further action, not a closed door.

Common Mistakes Rehab Providers Make With Prior Authorization and Appeals

1. Not appealing denials at all, given how few LTCH, IRF, and SNF denials actually get challenged despite high overturn rates when they are.
2. Submitting a prior authorization request without explicit documentation of functional status, rehabilitation potential, and required therapy intensity.
3. Failing to distinguish clearly between the clinical justification for IRF-level care versus SNF-level care in the initial request.
4. Treating a denial from a delegated third-party contractor the same as a denial from the plan's own internal review team, without recognizing that contractor denials have shown particularly high overturn rates on appeal.
5. Missing the expedited BFCC-QIO discharge appeal option and defaulting to a slower standard appeal process when time is genuinely a factor.
6. Not tracking denial and overturn patterns by specific MA plan, which makes it harder to anticipate which payers require more thorough upfront documentation.

Actionable Tips to Strengthen Requests and Appeals

1. Build a standardized documentation checklist specifically for IRF prior authorization requests, covering physician certification, functional status, and therapy intensity justification, so nothing critical gets left out under time pressure.
2. Track denial rates and appeal outcomes by specific MA plan, so your team knows in advance which payers historically require stronger upfront documentation.
3. Establish a fast internal workflow for requesting peer-to-peer reviews and filing expedited BFCC-QIO appeals, since speed genuinely affects both patient outcomes and bed utilization.
4. Loop referring physicians into the documentation process early, since physician certification gaps are a recurring, preventable cause of denial.
5. Appeal denials as a default practice rather than an exception, given how consistently the OIG data shows initial denials getting reversed.
6. Flag denials issued by known third-party review contractors for expedited appeal, given the particularly high overturn rates in that category.

Expert Recommendations

The single most useful lesson from the OIG's findings is that a denial is frequently a data quality or process problem on the payer's side, not a reflection of the clinical merits of the request. That reframing should change how rehab providers think about appeals internally. An appeal isn't an adversarial escalation. Based on this data, it's often simply the second, more thorough look a request needed to get approved in the first place.

Given how concentrated denials were among the largest plans and their delegated contractors, it's also worth building payer-specific playbooks rather than treating every MA plan's prior authorization process the same way. A plan with a documented pattern of high initial denials and high appeal overturns is a plan worth submitting unusually thorough documentation to from the start, since that extra effort upfront may prevent a denial that would otherwise require days of appeal work to reverse.

Finally, given the ongoing congressional and regulatory attention this issue is receiving, including direct outreach from Senate oversight committees to insurers named in these reports, this is a genuinely live policy area. Rehab providers and their associations, including groups like AMRPA that engaged directly with OIG on this report, have real standing to keep pushing for the data transparency and contractor accountability the OIG itself recommended.

Frequently Asked Questions

What did the June 2026 HHS OIG report find about Medicare Advantage rehab denials?

The OIG found that the largest Medicare Advantage organizations denied inpatient rehabilitation facility requests at rates up to 66 percent and long-term acute care hospital requests at rates up to 80 percent in June 2024, then overturned 43 percent of IRF denials and 36 percent of LTCH denials on appeal.

How does this compare to skilled nursing facility denials?

A companion OIG report found MA plans denied 12 percent of SNF admission requests on average, but overturned 95 percent of appealed SNF denials, with one plan overturning 99.7 percent of appeals it received.

Which Medicare Advantage plans had the highest rehab denial rates?

UnitedHealthcare denied 66 percent of IRF requests, Humana denied 54 percent, and Aetna denied 51 percent, compared to a 41 percent average among the other plans reviewed. CVS Health denied 80 percent of LTCH requests, among the highest in the review.

Does Original Medicare use prior authorization for rehab admissions the same way Medicare Advantage does?

No. Original Medicare's access barriers are structural, most notably the three-day qualifying inpatient hospital stay requirement for SNF coverage, rather than a discretionary, case-by-case prior authorization review like Medicare Advantage plans use.

Why do so many rehab denials get overturned on appeal?

The OIG suggested this pattern indicates a meaningful share of initial denials were inappropriate, particularly denials issued by third-party contractors like naviHealth, which MA plans overturned 97 percent of the time when appealed.

What is the BFCC-QIO fast-track appeal, and when should it be used?

It's an expedited appeal process for discharge-related disputes that can keep coverage running while the appeal is decided, and it's particularly useful when a patient is occupying an acute care bed awaiting a post-acute care decision.

What documentation most commonly supports a successful IRF prior authorization request?

Clear physician certification, documented functional status and rehabilitation potential, and justification for the intensive therapy schedule IRF-level care requires are among the most commonly missing elements in denied requests.

Should rehab providers appeal every denial?

Given that a large share of LTCH, IRF, and SNF denials get overturned on appeal, and that only about a third of LTCH and IRF denials and less than a fifth of SNF denials are appealed at all, treating appeal as the default response rather than the exception is a reasonable strategy based on this data.

What did the OIG recommend to CMS as a result of these findings?

OIG recommended CMS regularly collect request-level prior authorization data, including service type and contractor information, and investigate the reasons behind wide variation in denial and overturn rates across plans and contractors.

Is this prior authorization issue likely to change soon?

It remains an active area of regulatory and congressional attention, with Senate oversight committees directly questioning insurers named in the reports and ongoing legislative discussion around prior authorization reform, though no finalized regulatory change had resulted from these specific reports as of this writing.

Conclusion

The June 2026 OIG reports put verified numbers behind something rehab providers have argued for years, that a meaningful share of Medicare Advantage denials for post-acute rehabilitative care don't hold up once someone actually pushes back. With IRF denial rates reaching 66 percent at the largest plan and appeal overturn rates reaching 86 percent at the plan level, the data makes a clear case that a denial shouldn't be treated as a final answer. Building stronger upfront documentation, tracking payer-specific patterns, and appealing consistently rather than selectively are the concrete steps that translate this federal finding into fewer delayed patients and less unpaid administrative work for your practice.

Get Help With Medicare Advantage Rehab Denials

Prior authorization and appeals for post-acute rehabilitative care carry real revenue and patient access stakes, and the data now confirms what many rehab providers already suspected: a lot of initial denials simply don't survive scrutiny. Edge RCM works with rehabilitation facilities, PT, OT, and SLP practices, and referring physician groups on Medicare Advantage prior authorization support, documentation review, and denial appeals, so fewer medically necessary requests get denied in the first place, and the ones that are get overturned quickly. If your practice is absorbing avoidable rehab denials, Edge RCM can help you build a stronger process before the next request goes out.