CMS Prior Authorization Denied: How to Appeal" class="auto-link">Prior Authorization Reforms: What Changed for Medicare Advantage in 2024–2026

Prior authorization has long been one of the most controversial practices in health insurance — and nowhere more so than in Medicare Advantage, where plans have used it aggressively to delay and deny care. Between 2023 and 2026, CMS enacted the most significant prior authorization reforms in the history of Medicare Advantage. If you or a family member has a Medicare Advantage plan, you need to know what these rules require.

Background: Why Prior Auth Reform Was Needed

Prior to 2024 reforms, Medicare Advantage plans denied hundreds of thousands of prior authorization requests each year. A 2022 HHS Office of Inspector General (OIG) report found that 13% of prior authorization denials by Medicare Advantage plans were for services that met Medicare coverage criteria — meaning the denials were improper. The report also found that 75% of these improper denials were eventually reversed on appeal, suggesting systemic overuse of denials.

Congress passed the Improving Seniors' Timely Access to Care Act in 2022, and CMS finalized implementing rules in 2024. Additional reforms under CMS's MA regulations took effect for 2025 and 2026 plan years.

The Key Changes Under 2024–2026 CMS Reforms

1. Electronic Prior Authorization Medicare Advantage plans must implement electronic prior authorization processes compliant with ONC interoperability rules. This reduces administrative burden on physicians and speeds decision timelines.

2. Stricter Decision Timelines

Under revised CMS rules for Medicare Advantage:

• Standard (non-urgent) prior authorization: Decisions within 7 calendar days of receiving the request (reduced from 14 days)
• Urgent/expedited prior authorization: Decisions within 72 hours (for situations where standard timelines could seriously jeopardize the enrollee's life, health, or ability to regain maximum function)
• Concurrent review (inpatient/continuing services): Decisions must come before the existing authorization period ends, with adequate notice

3. Continuity of Care During Transition For enrollees who switch between Medicare Advantage plans (or switch from traditional Medicare to Medicare Advantage), plans must:

• Continue current treatments for at least 90 days without a new prior authorization
• Honor prior authorizations that were approved under a previous plan for the same services

4. Gold Carding (Exemption for High-Performing Providers) Some states have enacted gold carding laws requiring that providers with strong prior authorization approval records receive automatic approvals (exemption from PA requirements) for certain services. While federal CMS rules encourage this practice for MA plans, the approach continues to be implemented unevenly. Check whether your plan has a gold card program that has exempted your specialist from PA requirements.

5. Prohibition on Post-Service Denial for Previously Authorized Services CMS rules reinforce that if a Medicare Advantage plan approves a prior authorization and the service is provided as authorized, the plan cannot subsequently deny payment for that service based on lack of medical necessity. If you have an authorization number, the insurer has committed to paying.

6. Transparency in Criteria Medicare Advantage plans are now required to:

• Publicly post their prior authorization requirements and criteria
• Make clinical coverage policies accessible to enrollees and providers
• Explain in denial notices which specific clinical criteria were not met

7. National Coverage Determination (NCD) Compliance A foundational reform: Medicare Advantage plans must cover the same services that original Medicare covers under National Coverage Determinations (NCDs) and Local Coverage Determinations (LCDs). Plans cannot apply prior authorization requirements in ways that are more restrictive than original Medicare — they cannot deny services that original Medicare would cover.

What This Means for Medicare Advantage Enrollees

If you are on a Medicare Advantage plan and your prior authorization was denied, ask these questions:

Does original Medicare cover this service? If yes, the MA plan may be improperly restricting coverage. Reference the applicable NCD or LCD and state explicitly that original Medicare covers this service.

Did the plan meet the required decision timeline? If your standard PA was pending for more than 7 days, the plan may have violated CMS requirements. Document when the PA was submitted and when you received the decision.

Was the denial reason specific? Under new transparency requirements, the denial notice must explain which specific criteria were not met. If the denial is vague, request a more detailed explanation and the clinical criteria used.

Was the denial upheld after a peer-to-peer review? Under the 2022 legislation, MA plans must make a clinical peer-to-peer process available before finalizing a denial.

How to Appeal a Medicare Advantage Prior Authorization Denial

Medicare Advantage plans have a structured appeals process:

1. Redetermination (Level 1): File with the MA plan. Decision within 60 days (standard) or 72 hours (expedited).
2. Reconsideration (Level 2): File with the independent review entity (IRE) contracted by CMS — currently Maximus. Decision within 60 days (standard) or 72 hours (expedited).
3. Administrative Law Judge (Level 3): If the amount in controversy meets the threshold ($180+ for 2025 appeals). Decision within 90 days.
4. Medicare Appeals Council (Level 4): Review by the HHS Departmental Appeals Board.
5. Federal Court (Level 5): Judicial review if the amount in controversy meets the threshold.

For urgent appeals, request expedited review at every level and document why delay is medically harmful.

Filing an expedited appeal: Call the plan and state: "I am requesting an expedited appeal of this prior authorization denial pursuant to 42 CFR 422.572. My physician has documented that applying standard timelines could seriously jeopardize my life/health/ability to regain maximum function." The plan must decide within 72 hours.

Filing a Complaint With CMS

If a Medicare Advantage plan violated the prior authorization reform requirements — missed the 7-day deadline, applied criteria more restrictive than original Medicare, failed to provide transparency, or violated continuity of care — file a complaint at:

• Medicare.gov: File a complaint online or call 1-800-MEDICARE
• CMS Regional Office: Contact the CMS regional office for your state
• 1-800-HHS-TIPS: For potential fraud or egregious violations

CMS takes compliance with the 2024 reforms seriously and has increased MA plan auditing related to prior authorization compliance.

Fight Back With ClaimBack

Whether you're dealing with a Medicare Advantage prior authorization denial or an appeal under the new CMS rules, ClaimBack helps you build a structured, evidence-backed appeal that cites the specific regulatory violations and coverage rights applicable to your situation.

Start your appeal at ClaimBack

Related Reading

• Internal vs. External Insurance Appeal
• What Is Medical Necessity?
• Common Reasons Insurance Claims Are Denied