Demand letters
How do I send an insurance claim appeal letter with proof?
Updated · By the Certified Letter Online team
Send your appeal to the appeals address in the denial letter, with the claim number, why the decision is wrong and supporting documents, by Certified Mail with return receipt. For health insurance, you generally have 180 days from the denial notice to file an internal appeal, and if it's upheld you can ask for an independent external review, generally within four months.
Other insurance (auto, home, life) follows the policy and state law; your state insurance department can tell you the rules and takes complaints.
| Step | Deadline | Where |
|---|---|---|
| Internal appeal | Within 180 days of the denial notice | Appeals address in the denial letter |
| Insurer decision | Depends on the type of claim (urgent, pre-service, post-service) | Insurer |
| External review request | Generally within 4 months of the final internal denial | As stated in the final denial |
| Complaint | Any time | State insurance department |
What to include
- Policy and claim numbers, patient name and date of service.
- The decision you're appealing and why it's wrong.
- A letter of medical necessity from your doctor, if relevant, as extra pages.
- A request for a copy of your claim file. Start from our insurance appeal letter.
Notes
This guide is general information, not legal advice. For your specific situation, a legal aid office or a licensed attorney in your state can tell you what applies.
Quick answers
Should I send my insurance claim appeal certified mail?
Yes. Appeals have deadlines and insurers sometimes lose paperwork; a return receipt proves when they got it.
Can I appeal by phone or online?
Many insurers accept online or fax appeals. Whatever you use, keep proof of the date you filed.
How do I mail a complaint to my state insurance commissioner?
What to do next
Fill in the appeal letter, attach your documents as extra pages, and we'll mail it Certified with return receipt for $17.99.
Send my appealSources
- HealthCare.gov: Internal appeals
- HealthCare.gov: External review
- NAIC: Find your state insurance department
Checked: . General information, not legal advice. Fees and rules change: confirm current values at the official links above.