How to write a health insurance appeal letter
A step-by-step structure for an appeal letter that cites the insurer's own policy and the records that support your case.
The structure that works
An effective appeal letter is short, specific, and references the insurer's own policy. Three pages or fewer.
Open with the member ID, claim number, date of denial, and the decision you want.
Cite the insurer's clinical policy bulletin by name and number, then map your records to its criteria one by one.
What to include
Letter of medical necessity from the treating physician.
Relevant office notes from the past 12 months.
Imaging or lab reports that meet the policy criteria.
Specialty guideline citations (NCCN, ACR, AAO, AAN, etc.).
What to leave out
Emotional appeals without clinical backing rarely move the needle.
Do not include records unrelated to the denied service.
Do not send originals; keep copies of everything.
Upload the denial letter. Free analysis first, finished letter second.
FAQ
How long should an appeal letter be?+
Three pages or fewer for the letter itself, plus attachments. The reviewer is reading dozens of files; brevity wins.
Do I need a lawyer?+
Not for most internal appeals. Self-help works when the appeal is built around the insurer's own clinical policy and the records that match it.
More guides
- Internal appeal vs external review: what is the difference
- Expedited appeals: when to ask for an urgent review
- The No Surprises Act and out-of-network bills
- Health insurance appeal deadlines you need to know