Insurance denial appeal guides
Denied claims are appealable — and a large share of appeals succeed. These free, plain-English guides explain how to fight each type of denial: why it happens, the exact steps to take, the evidence that works, and the mistakes to avoid.
How to appeal a “Not medically necessary” denial
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.
Read the guide →How to appeal a “Prior authorization issue” denial
How to appeal a denial for missing or invalid prior authorization — including when a missing approval shouldn't cost you coverage.
Read the guide →How to appeal a “Out-of-network denial or reduction” denial
How to appeal an out-of-network denial or reduced payment — including the surprise-billing protections that may apply.
Read the guide →How to appeal a “Experimental / investigational” denial
How to appeal a denial that labels your treatment 'experimental' or 'investigational' using evidence-based support.
Read the guide →How to appeal a “Billing or coding error” denial
How to fix and appeal a denial caused by a billing or coding error — often resolved with a corrected claim.
Read the guide →How to appeal a “Service not covered / benefit exclusion” denial
How to appeal a denial that says a service isn't a covered benefit — including how to challenge vague exclusions.
Read the guide →Ready to write your appeal?
Our free generator builds a tailored appeal letter, an escalation letter, and a phone script — entirely in your browser, with nothing stored or uploaded.