How to Appeal an Insurance Denial in 2026: 6-Step Playbook
Appeal success rates hit 55%+ with this 6-step framework. Timelines, peer-to-peer tactics, and documentation language that overturns denials.
Know Your Deadlines
Every appeal has a clock. Commercial plans typically give 180 days from the denial notice for the first-level internal appeal. Medicare Advantage gives 60 days. Medicaid varies by state but is usually 60-90 days. Missing the window almost always forfeits the appeal right, so the first thing to do when you see a denial is calendar the deadline.
Read the Denial Letter Carefully
The denial letter must state the specific reason and cite the medical policy used. That citation is your roadmap. If the denial says "fails criterion 3 of policy X", pull policy X and address criterion 3 directly in your appeal — not the other criteria.
Gather the Right Evidence
An appeal is only as strong as its evidence.
- ✓ Full chart notes covering the diagnosis and prior therapies
- ✓ Lab and imaging results that support medical necessity
- ✓ Prior therapy documentation with dates, doses, durations, and outcomes
- ✓ Peer-reviewed literature supporting the requested treatment
- ✓ Relevant guideline citations (NCCN, ACR, ADA, AHA, etc.)
- ✓ The payer's own medical policy — quote it back to them
Write a Structured Appeal Letter
Open with a one-sentence summary: patient, diagnosis, requested treatment, reason for appeal. Then walk through the denial rationale point by point, rebutting each with evidence. Close with a clear ask and your contact info for peer-to-peer.
Use Peer-to-Peer Strategically
Most commercial denials can be escalated to a peer-to-peer conversation with the plan's medical director. Prepare a 2-minute case summary, have the chart open, and anchor on guideline language. Peer-to-peers overturn 40-60% of denials when the clinician is prepared.
External Review: The Final Level
If internal appeals fail, most plans are required to offer an independent external review. External reviewers overturn denials about 40% of the time nationally — higher for specialty drugs. Don't stop at the internal appeal.
How RxCheckUp Accelerates Appeals
RxCheckUp reads the denial letter, extracts the specific policy criteria, pulls the matching clinical evidence, and drafts a targeted rebuttal letter in under 60 seconds. Clinicians review, add any chart-specific details, and send.