Insurance Appeal Letter
Use this complaint letter template to appeal a denied insurance claim. Customize with your claim number, dates, and supporting details.
When to use this letter
Send this when an insurer has denied a claim you believe was medically necessary or otherwise valid. A written appeal creates a paper trail and formally requests a review, which is often required before you can escalate to a state insurance regulator.
What to gather
Policy number, denial letter, medical records or bills, doctor notes, and any prior authorization or referral. Having dates and provider names ready makes the appeal stronger.
What to include in your letter
Include your policy and claim numbers, denial date, reason stated by the insurer, and the evidence supporting your appeal. End with a direct request for reconsideration and written response.
Sample opening
"I am writing to formally appeal the denial of my claim (Claim/Policy # [NUMBER]). I believe this denial was made in error and request a full review."
What happens after you send
Insurers usually respond with a decision or request for more records. Keep your mailed copy and timeline so you can respond quickly and escalate if needed.
Insurance appeal FAQ
Can I appeal more than once?
Often yes. Many plans allow internal and external review paths. Your policy documents explain which stage comes next.
Should I attach medical documents?
Reference your supporting documents clearly in the letter. Provide records through the insurer channel they require.
Does this guarantee approval?
No. This template improves clarity and documentation, but approval still depends on policy terms and insurer review.
Related resources
- How to write a complaint letter
- How to write an insurance appeal letter
- All complaint letter templates
- Medical billing dispute template
Letter preview
We fill in the rest, including your treatment details, supporting evidence, and a clear request for reconsideration, then print and mail it for free.