Medicare Advantage SNF Denials: OIG Finds 95% of Prior Authorization Appeals Succeed

The Growing Challenge of Medicare Advantage SNF Denials

A federal watchdog report released in 2024 uncovered a striking pattern: when Medicare Advantage enrollees appealed prior authorization denials for Skilled Nursing Facility admission, they won 95% of the time. That figure alone raises serious questions about why those denials were issued in the first place.

Medicare Advantage plans are required by law to cover at least what Original Medicare covers, including SNF care. Yet these plans have broad authority to require prior authorization before approving that care. The U.S. Department of Health and Human Services Office of Inspector General (OIG) found that this authority is increasingly being used in ways that delay or block medically necessary treatment.

Understanding how this process works, and what you can do if you face a denial, is essential for anyone enrolled in, or considering, a Medicare Advantage plan.

Understanding Skilled Nursing Facility Care and Medicare Eligibility

Skilled Nursing Facilities provide short-term, medically supervised care for people recovering from illness, injury, or surgery. Services typically include wound care, medication management, physical therapy, occupational therapy, and speech therapy. This level of care sits between a hospital stay and returning home or transitioning to long-term residential care.

To understand why prior authorization denials are so consequential, you first need to know how Medicare, both Original and Advantage, defines eligibility for SNF coverage. The rules are specific, and MA plans have some flexibility in how they apply them.

Medicare's 3-Day Qualifying Inpatient Hospital Stay Rule

Under Original Medicare, beneficiaries must have a medically necessary inpatient hospital stay of at least three consecutive days, not counting the discharge day, and not counting time spent under observation status, before Medicare will cover SNF care. The SNF admission must also generally occur within 30 days of hospital discharge and be for a condition related to that stay.

Many Medicare Advantage plans have the discretion to waive this three-day requirement, which can broaden access in some cases. However, MA plans substitute their own criteria, which can be stricter in other ways. You can learn more about how Medicare covers skilled nursing facilities under both Original Medicare and MA plans.

The Skilled Care Requirement

Beyond the hospital stay, Medicare requires that the care received in the SNF must be "skilled" meaning it requires qualified professionals such as registered nurses or licensed therapists. That care must also be needed on a daily basis and be impractical to provide at home.

MA plans frequently deny SNF admissions by arguing the requested care doesn't meet their definition of "skilled" or could be handled at a lower level of care, such as home health or outpatient therapy. Understanding what "medically necessary" means in the context of Medicare can help you anticipate and respond to these denials.

The Medicare Advantage Payment Model and Incentives for Denial

Medicare Advantage plans receive a fixed monthly payment from the federal government for each enrolled beneficiary, regardless of how much care that person actually uses. This is called a capitated payment model, and it creates a structural dynamic worth understanding.

When a plan spends less on care, it retains more of that fixed payment. This financial reality does not mean every denial is motivated by profit, but it does create an environment where limiting access to high-cost services like SNF care can be financially advantageous for the insurer.

Research consistently shows that for-profit MA plans tend to have higher denial rates than non-profit plans, which aligns with the theory that financial incentives shape utilization management decisions. Prior authorization is the primary tool used to achieve this. Notably, 99% of MA enrollees are in plans that require prior authorization for at least some services, a requirement that does not exist under traditional Medicare.

This structural difference is one reason many beneficiaries who switch from Original Medicare to Medicare Advantage are surprised by access barriers they didn't encounter before. Understanding the differences between Original Medicare and Medicare Advantage before enrolling is critical.

OIG's Scrutiny: Widespread Inappropriate Denials for SNF Admission

The HHS Office of Inspector General has consistently flagged concerns about how MA plans use prior authorization. Their June 2024 report on SNF admissions made the issue impossible to ignore: a 12% denial rate combined with a 95% appeal overturn rate points to a systemic pattern of initial denials that don't hold up to scrutiny.

A 95% overturn rate is not a statistical anomaly. It means that when an independent reviewer examines the same cases the plan initially rejected, the reviewer concludes, nearly every time, that the care was appropriate and should be covered. That pattern strongly suggests the denials were not clinically justified.

The Role of Utilization Management Tools and AI (e.g., NaviHealth)

Third-party contractors handle a significant share of prior authorization decisions for MA plans. NaviHealth, a subsidiary of UnitedHealth Group, processed approximately half of all SNF admission requests reviewed in the OIG study. Its denial rate of 14% was higher than both internal plan reviews (11%) and other contractors (9%).

What makes those numbers striking is what happened next: 97% of NaviHealth's denials were overturned on appeal. NaviHealth has faced public criticism for its use of algorithmic tools to generate predicted lengths of stay, which critics argue are used to cut off coverage before patients are clinically ready for discharge. When a system produces denials that are overturned nearly universally, it raises serious questions about the accuracy and oversight of those tools.

Beyond NaviHealth: Systemic Denial Patterns Across Major MA Plans

The OIG data reveals wide variation in denial rates across MA plans, ranging from 0.4% to 23% for SNF admissions. The problem extends well beyond a single contractor.

For post-acute care broadly, including long-term care hospitals (LTCHs) and inpatient rehabilitation facilities (IRFs) major insurers showed notable denial concentrations. In June 2024, Aetna denied 80% of requests for long-term care hospital stays, Humana denied 72%, and UnitedHealthcare denied 71%, all significantly above the 42% average for other insurers in the same analysis. These figures point to industry-wide patterns, not isolated exceptions.

Real-World Impact: How Denials Affect Beneficiaries

Statistics tell part of the story. But behind each denial is a person, often elderly, recently hospitalized, and in need of skilled rehabilitation, who must navigate an appeals process while still recovering.

Inappropriate SNF denials can delay medically necessary care by days or weeks, a timeframe that can meaningfully affect recovery outcomes after a stroke, hip fracture, or major surgery. Beneficiaries may also face unexpected out-of-pocket costs if they accept a lower level of care that turns out to be inadequate or if they pay for SNF services while awaiting appeal results.

Patient Experiences and the Burden of Appeals

Even when the appeals process works, it is neither quick nor simple. The OIG found an average wait time of six days for appeal decisions, six days during which a patient recovering from surgery may be in a facility that cannot provide the care they need, or may be discharged prematurely.

Perhaps most telling: only about 18% of SNF denials are ever appealed. Given that 95% of those appeals succeed, the vast majority of inappropriate denials are never challenged. Many beneficiaries don't know they have the right to appeal, feel too unwell to pursue it, or simply don't have family support to help. You can review your Medicare rights and protections to better understand what options are available.

Alternatives to SNF: Home Health vs. Extended Hospital Stays

When SNF care is denied, plans often recommend home health services or outpatient therapy as alternatives. For some patients, these options are appropriate. For others, those requiring daily skilled nursing, complex wound care, or intensive physical rehabilitation, they fall short of what's medically needed.

Denials can also result in extended hospital stays while patients and families pursue appeals, which carries its own costs. Under many MA plans, beneficiaries face daily hospital co-pays that accumulate quickly. In these cases, the denial intended to reduce costs for the plan may actually increase overall costs while reducing care quality for the enrollee.

Opportunities for Reform: Strengthening Oversight and Beneficiary Protections

The OIG's findings have accelerated calls for reform at multiple levels, regulatory, legislative, and operational. The core goal is to ensure that prior authorization serves as a clinical check, not a financial barrier.

CMS has expanded its auditing focus on utilization management and compliance. Enforcement tools range from corrective action plans and civil monetary penalties to enrollment freezes. The OIG has specifically recommended that CMS collect and publicly report request-level prior authorization data to identify concerning patterns before they become entrenched.

Strengthening CMS Oversight and Enforcement Actions for Prior Authorization

CMS has the authority to impose significant sanctions on MA plans found to be systematically denying medically necessary care. Increased audit frequency and more detailed data collection requirements are part of the agency's evolving oversight strategy.

New CMS reporting requirements taking effect in March 2026 will mandate that insurers publicly disclose approval and denial metrics. While this is a step forward, advocates and the OIG have called for more granular, service-specific data that would allow regulators and the public to identify outlier plans more precisely.

Congressional Prior Authorization Reform Legislation

The bipartisan "Improving Seniors' Timely Access to Care Act" (H.R. 3514) would require MA plans to use electronic prior authorization processes, meet timeliness standards, and report denial and approval data by item and service, data that would be made publicly available. The legislation has broad support from provider groups and patient advocates.

A separate proposal, the "Reducing Medically Unnecessary Delays in Care Act of 2025," would require that prior authorization decisions be made by board-certified physicians applying recognized medical necessity criteria. Together, these bills represent the most significant potential reform of MA prior authorization practices in years. You can review the general Medicare appeals process to understand existing pathways while legislative changes develop.

Improving Transparency and Data Reporting for SNF Denials

Transparency is foundational to accountability. When beneficiaries, providers, and policymakers can see denial rates broken down by plan and service type, they can make better decisions and regulators can act more quickly.

Requiring MA plans to clearly communicate which SNF services require prior authorization, and the specific clinical criteria applied, would reduce ambiguity and help providers submit stronger initial requests. Publicly available plan-level denial data would also give beneficiaries a practical tool for comparing plans during enrollment periods.

What Beneficiaries Can Do Now: Navigating MA Prior Authorization Denials

If your Medicare Advantage plan denies coverage for a Skilled Nursing Facility admission, you have options, and the data strongly suggests that pursuing them is worth it.

The most important first step is to act quickly. Appeals have deadlines, and delays in initiating the process can create additional clinical and administrative complications. Having the right documentation ready from the start makes a meaningful difference in outcomes.

Understanding Your Appeal Rights

Every Medicare Advantage enrollee has the right to appeal any coverage denial. For SNF admissions, this typically begins with a request for reconsideration, followed by additional levels of review if needed. Your plan must provide written notice of the denial, including the reason and instructions for appealing.

When preparing your appeal, gather all relevant medical records, physician notes, and a letter from your doctor documenting the medical necessity of SNF-level care. A well-documented appeal is far more likely to succeed. You can also review what prior authorization means within your plan by reading about Medicare prior authorization rules more broadly.

💡 Eddie's Pro Tip

The biggest mistake I see is waiting too long to appeal. The moment you get that denial letter, get your doctor on the phone and ask for a letter of medical necessity. If you are still in the hospital or SNF, request an expedited appeal. You have the right to a decision within 72 hours. And if you feel overwhelmed, call your state SHIP program. They do this every day and they are free.

Seeking Assistance: Medicare Rights Center and SHIPs

You don't have to navigate this process alone. The Medicare Rights Center (800-333-4114) offers free, confidential counseling for beneficiaries dealing with denials and appeals. State Health Insurance Assistance Programs (SHIPs) provide similar free, unbiased support in every state.

These organizations can help you understand your rights, prepare paperwork, and communicate with your plan. Their involvement can make a significant difference, particularly for beneficiaries who are still recovering and don't have family support available.

Choosing a Plan: Resources for Informed Decisions

Before enrolling in a Medicare Advantage plan, ask specifically about the plan's prior authorization requirements for SNF services. Use the official Medicare Plan Finder tool to compare available plans in your area. Look beyond the monthly premium, consider the plan's out-of-pocket maximum, network restrictions, and any available data on how frequently the plan approves or denies SNF requests.

If prior authorization barriers are a concern, it may also be worth exploring whether a Medicare Supplement (Medigap) plan better fits your needs. Medigap plans generally do not require prior authorization for Medicare-covered services, which can provide more predictable access to post-acute care.

Advocating for Transparent and Equitable Access to SNF Care

The pattern is clear: when Medicare Advantage prior authorization denials for Skilled Nursing Facility admission are challenged, they are overturned nearly every time. That isn't a system working correctly, it's a system producing decisions that consistently fail review.

Regulatory action, legislative reform, and greater data transparency are all moving forward, though change takes time. In the meantime, the most effective protection available to you is knowing your rights and being willing to use them. Appeal denials. Seek help from SHIP counselors or the Medicare Rights Center. Ask hard questions about prior authorization practices before choosing a plan.

The goal of Medicare, in any form, is to ensure you get the care you need. When prior authorization becomes a barrier to that goal, speaking up and pushing back is not just your right. It's often the most effective thing you can do.

Frequently Asked Questions