Prior Authorization Denied: How to Appeal and Get Your Procedure Covered

Why Prior Auth Gets Denied

Prior authorization denials fall into a small number of recurring categories. Knowing which type you're facing determines your appeal strategy:

First Steps After a Denial

When you receive a prior auth denial:

1. Get the written denial letter. If your provider received the denial, ask them to send you a copy. The letter must state the specific reason for denial and the clinical criteria that were applied.
2. Find the insurer's clinical policy. Most insurers publish their coverage guidelines online. Search for the insurer name plus "clinical policy" or "medical coverage policy" plus the service name. Your appeal should directly address the listed criteria.
3. Call your insurer's Member Services immediately. Ask for the denial reason in plain language and whether a peer-to-peer review is available. Note the representative's name and the date.
4. Tell your doctor's office the same day. They need to request peer-to-peer review quickly—this window often closes after 48–72 hours.

Peer-to-Peer Review: Your Fastest Option

A peer-to-peer review is a direct phone call between your treating physician and the insurance company's medical director or clinical reviewer. It is often the single most effective tool for overturning prior auth denials—particularly medical necessity denials—and it costs nothing.

How to make it work:

• Act quickly: Most insurers allow peer-to-peer requests within 24–72 hours of the denial. Your doctor's office should call the insurer's utilization management line the same day or the next morning.
• Brief your doctor beforehand: The physician should go into the call with specific clinical evidence—lab values, imaging results, failed prior treatments—ready to address the insurer's stated denial criteria point by point.
• Document the call: Your doctor's office should note who participated, what was discussed, and the outcome. Get the insurer's response in writing after the call.
• If the insurer won't schedule peer-to-peer: This is itself a potential violation in some states. Proceed to formal internal appeal immediately.

The Appeals Ladder: Internal → IRO → State Commissioner

If peer-to-peer review doesn't resolve the denial, escalate through the formal appeals process:

Step 1: Internal Appeal

File a written appeal within the deadline on your denial letter (typically 180 days for commercial plans under ACA rules; 60 days for Medicare Advantage plans). Your appeal package should include:

• Physician letter of medical necessity addressing the insurer's specific denial criteria
• Relevant medical records (lab results, imaging, prior treatment history)
• Published clinical guidelines from specialty societies supporting the treatment
• Any state override laws that apply (step therapy, experimental treatment)

The insurer must respond within 7 days for pre-service prior auth appeals under No Surprises Act rules (30 days under older ACA rules for some plan types). Urgent prior auth appeals require a decision within 72 hours.

Step 2: IRO External Review

If the insurer upholds its denial at the internal level, request review by an Independent Review Organization. You typically have 4 months from the final internal denial to file. The IRO is accredited and neutral—its decision is binding on the insurer under state and federal law.

Send the IRO everything: the denial letters, all appeal submissions, physician letters, records, and clinical guidelines. IRO reviewers consider only the written record, so more evidence is always better.

Step 3: State Insurance Commissioner Complaint

If the IRO upholds the denial—or if the insurer violated procedural rules at any point (missed deadlines, failed to offer peer-to-peer, failed to provide a written denial)—file a complaint with your state insurance commissioner. Most state insurance departments have online complaint forms and will investigate within 30–45 days.

For self-funded employer plans governed by ERISA, file with the Department of Labor's Employee Benefits Security Administration (EBSA) at 1-866-444-3272 or askebsa.dol.gov.

Federal Timelines Under the No Surprises Act

The No Surprises Act (NSA) and implementing CMS rules impose strict prior authorization response timelines. Violation of these timelines is grounds for a complaint to your state insurance commissioner or CMS:

Beginning in 2026, CMS rules also require health plans to provide specific clinical reasons for every prior auth denial—generic "not medically necessary" responses without citing specific criteria are no longer permitted for many plan types.

Formulary and Step Therapy Denials

Pharmacy prior auth denials require a slightly different approach:

• Formulary exception: Request through your insurer's pharmacy benefit manager (PBM). Your prescribing physician must document why the formulary alternative won't work for you—contraindications, prior treatment failures, or unique clinical circumstances.
• Step therapy override: If you're denied because you haven't "failed" a cheaper drug first, but you can't take that drug (allergy, contraindication, prior failure), your state may have a step therapy override law. At least 30 states require insurers to waive step therapy when documented medical reasons exist.
• Non-medical switching: If your insurer is forcing you to switch from a drug that has been working to a different drug for cost reasons, some states prohibit non-medical switching for stable patients. Check your state's protections.

Building a Strong Appeal Letter

A winning prior auth appeal letter has four components:

1. Statement of facts: Claim or auth number, date of denial, service or drug requested, and the denial reason cited in the insurer's letter.
2. Clinical argument: Address each denial criterion by name from the insurer's clinical policy. Don't make general statements—respond to each specific criterion.
3. Supporting evidence: List each document attached (physician letter, medical records, published guidelines, lab results). The IRO will only see what you submit.
4. Requested relief: State explicitly: "I request that [INSURER] approve prior authorization for [SERVICE] effective [DATE]."

Key Contacts and Deadlines

• Internal appeal deadline: 180 days from denial (commercial) / 60 days from denial (Medicare Advantage)
• IRO external review deadline: 4 months from final internal denial
• Insurer's utilization management line: Printed on your insurance card or denial letter
• No Surprises Help Desk: 1-800-985-3059 (for federal NSA violations)
• EBSA (ERISA employer plans): 1-866-444-3272 / askebsa.dol.gov
• State insurance commissioner: Search "[your state] insurance commissioner complaint" for the online form
• CMS (Medicare Advantage): 1-800-MEDICARE (1-800-633-4227)

• CMS — No Surprises Act (Prior Auth Rules)
• CMS — ACA External Review Requirements
• Department of Labor — ERISA Appeals Rights
• NCSL — State Prior Authorization Laws
• KFF — Claims Denials and Appeals in ACA Plans