Insurance Claim Denial Appeal Letter Template
A denied claim is not the final word — plans have an internal appeals process, and denials are frequently overturned. Use the template below to file a written appeal referencing your Explanation of Benefits (EOB) and the reason given for the denial.
When to use this letter
- Your claim was denied as 'not medically necessary'
- The service was billed as out-of-network by mistake
- The denial reason on your EOB doesn't match what happened
The template
Replace everything in [brackets] with your details.
[Your name] [Your address] [Member ID] [Date] Appeals Department [Insurance company name] [Address from your EOB or denial letter] Re: Appeal of denied claim Claim #[claim number], Date of service [date], Provider [provider name] To whom it may concern, I am formally appealing the denial of the claim referenced above. According to the Explanation of Benefits dated [EOB date], the claim was denied for the following reason: "[quote the denial reason exactly]". I believe this claim should be covered because: 1. [Your reason — e.g. the service was ordered by my physician for X condition] 2. [Any supporting detail — referral, prior authorization, medical records] I have enclosed: [list anything you're attaching — EOB, doctor's note, medical records]. Please review this appeal and reconsider coverage of this claim. Under my plan, I understand I am entitled to an internal appeal, and to an external review if the denial is upheld. Please send your written determination to [address / email]. Sincerely, [Your name] [Phone]
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Decode my document freeHow to use it
- 1Find the exact denial reason on your EOB or denial letter and quote it.
- 2Ask your doctor's office for a short letter of medical necessity or records if relevant.
- 3Submit before the deadline on your denial notice (often 180 days).
- 4If the internal appeal is denied, ask about an independent external review.
FAQ
How often are denials overturned?
A meaningful share of appealed claims are reversed. Filing a written internal appeal — and, if needed, an external review — is your plan's built-in process for disputing a denial.
What's the deadline to appeal?
It's on your denial notice, commonly around 180 days from the denial. File as early as you can and keep proof of the date you sent it.
Related templates
This template is general information, not legal, medical, or financial advice. For a specific or high-stakes situation, consider consulting a professional.