Insurance denied your claim? Fight back in minutes.
Most denied health-insurance claims are never appealed — yet a large share of appeals succeed. AppealBrain drafts a strong appeal letter for you. Your information never leaves your browser.
No account. No data stored.
Covers common denial reasons
How it works
Answer a few questions
Tell us the denial reason, your plan type, and basic claim details. Takes about 3 minutes.
Get a professional letter
We assemble a tailored appeal letter, an escalation letter, and a phone script — with your rights and an estimated deadline.
Edit, export, and send
Fine-tune the wording, download as PDF or text, attach the suggested documents, and send it in.
Free appeal guides
Plain-English help for every denial reason — and your appeal rights in all 50 states.
Not medically necessary
A step-by-step guide to appealing a health insurance denial that says your care was 'not medically necessary' — and the evidence that works best.
Prior authorization issue
How to appeal a denial for missing or invalid prior authorization — including when a missing approval shouldn't cost you coverage.
Out-of-network denial or reduction
How to appeal an out-of-network denial or reduced payment — including the surprise-billing protections that may apply.
Experimental / investigational
How to appeal a denial that labels your treatment 'experimental' or 'investigational' using evidence-based support.
Billing or coding error
How to fix and appeal a denial caused by a billing or coding error — often resolved with a corrected claim.
Service not covered / benefit exclusion
How to appeal a denial that says a service isn't a covered benefit — including how to challenge vague exclusions.
Built to protect your privacy
Your letter is generated entirely in your browser. We don't collect, store, or transmit your health information, claim details, or the letter you create — and the tool carries no ads or tracking. (Our free guide pages may show ads, which never see anything you type into the tool.)
Start now — it's free