How to Appeal a Denied Insurance Claim
A practical 7-step process to challenge denied claims and improve approval odds.
Updated 2026-03-26Start with the denial reason code
Pull your EOB and denial letter. Write down the exact reason code and insurer explanation. You need this language in every phone call and appeal letter.
Gather your supporting records
Collect itemized bills, clinical notes, referrals, prior authorization records, and your policy excerpt. Missing documentation is the most common avoidable failure point.
Call and document everything
Call member services and ask what exact evidence would reverse the denial. Capture date, time, representative name, and reference number. Keep one running log.
Submit a written appeal with structure
State who you are, claim ID, denial date, denial reason, and why it conflicts with your policy terms. Attach supporting records and request written confirmation.
Escalate to external review if needed
If internal appeal is denied, request external review through your state or plan process. External reviewers are independent and often overturn weak denials.
Ready to apply this to your own bill?
Upload your EOB and get a claim-by-claim review with an appeal prep plan.
Analyze My EOBNeed outside help?
Use official resources and vetted marketplaces to compare options and escalate appeals.
FAQ
How long do appeals take?
Most internal appeals take 30 to 60 days, with expedited paths for urgent care scenarios.
Can I appeal more than once?
Yes. Most plans have multiple levels of internal appeal followed by an external review option.