Getting a denial letter from your insurance company is frustrating — but it is rarely the end of the road. Many denied claims are overturned on appeal, often because the original decision was based on missing paperwork, a coding error or a misunderstanding of the facts. A clear, well-organized insurance claim appeal letter is the single most important tool you have to get that decision reversed.
This guide shows you exactly what to include, how to word it, and gives you templates you can copy for health, home and auto insurance appeals.
Quick note: This guide is general information, not legal advice. Always check your policy and your denial letter for the exact rules and deadlines that apply to you.
Before You Write: 4 Things to Do First
1. Read the denial letter carefully
Your denial letter (sometimes called an “Explanation of Benefits” or EOB for health insurance) should tell you:
- Why the claim was denied (the specific reason or policy clause)
- How to appeal and where to send your appeal
- The deadline for filing an appeal
Write these down. Your whole letter will be built around answering the reason for denial.
2. Check the deadline
Appeal deadlines vary by insurer, type of insurance and state. For many U.S. health plans, you have 180 days from the date of the denial notice to file an internal appeal, but your plan may be different. Missing the deadline can end your right to appeal, so treat it as the most important date on your calendar.
3. Get a copy of your policy
Find the exact section of your policy that covers the service, damage or loss you’re claiming. Quoting the policy language back to the insurer is one of the strongest things you can do.
4. Gather supporting evidence
Depending on the claim, this could include:
- Medical records and a letter of medical necessity from your doctor
- Photos and videos of damage
- Repair estimates, receipts and invoices
- Police or incident reports
- Previous correspondence with the insurer, including claim numbers and names of people you spoke to
What to Include in an Insurance Claim Appeal Letter
A strong appeal letter is factual, organized and polite. It should include:
- Your details: full name, address, phone number and email
- Policy details: policy number, claim number, and (for health insurance) the patient’s name and date of birth
- Date of service or date of loss
- A clear statement that you are appealing the denial
- The reason given for denial — quoted or summarized
- Why the decision is wrong, point by point, referring to your policy and your evidence
- A list of enclosed documents
- What you want: reconsideration and payment of the claim
- A request for a written response and a reasonable timeframe
Insurance Claim Appeal Letter Template (General)
[Your Full Name]
[Your Address]
[Phone Number] | [Email][Date]
[Insurance Company Name]
Attn: Appeals Department
[Address from your denial letter]Re: Appeal of Claim Denial — Policy No. [Number], Claim No. [Number]
Dear Appeals Department,
I am writing to formally appeal your decision to deny my claim number [claim number], dated [date of denial letter]. The claim relates to [brief description, e.g. “water damage to my kitchen on March 4, 2026”].
Your letter states that the claim was denied because [reason given]. I believe this decision is incorrect for the following reasons:
- [Reason 1 — e.g. “Section 4.2 of my policy specifically covers sudden and accidental water discharge from plumbing.”]
- [Reason 2 — e.g. “The enclosed plumber’s report confirms the pipe burst suddenly and was not the result of long-term leakage.”]
- [Reason 3, if any]
I have enclosed the following documents to support my appeal:
- [Document 1]
- [Document 2]
- [Document 3]
Based on this information, I respectfully request that you review and reverse the denial and process payment of my claim in accordance with my policy. Please send me a written response explaining your decision. If you need any further information, I can be reached at [phone] or [email].
Thank you for your prompt attention to this matter.
Sincerely,
[Signature]
[Printed Name]
Health Insurance Appeal Letter Template
Health insurance denials are often about medical necessity or prior authorization. The key is a supporting letter from your doctor.
Re: Request for Internal Appeal — Member ID [Number], Claim No. [Number]
Dear [Insurance Company] Appeals Unit,
I am requesting an internal appeal of the denial of coverage for [treatment/medication/procedure] provided to [patient name, date of birth] on [date of service], as described in your letter dated [date].
The denial states that the service was “[quote reason, e.g. not medically necessary].” My physician, Dr. [Name], has determined that this treatment is medically necessary because [short explanation]. Dr. [Name]’s letter of medical necessity and the relevant medical records are enclosed.
I also note that my plan’s coverage documents, under [section name/number], include coverage for [service] when [conditions], which apply in my case.
I ask that you overturn the denial and cover this service. Please confirm receipt of this appeal and provide a written decision.
Sincerely,
[Name]
Tip: If your internal appeal is denied, many health plans also give you the right to an external review by an independent third party. Your final denial letter should explain how to request it.
Auto Insurance Claim Appeal: Short Template
Re: Appeal — Policy No. [Number], Claim No. [Number], Date of Accident [Date]
Dear [Adjuster Name],
I am appealing your decision of [date] regarding my claim. Your letter states [reason, e.g. “the damage was pre-existing”]. However, the enclosed photos taken on [date], the police report (No. [number]) and the repair estimate from [shop] show that the damage to the [part of vehicle] was caused by the accident on [date].
I request that you reconsider and pay the claim of $[amount] under my [collision/comprehensive/liability] coverage. Please respond in writing within [e.g. 30] days.
Sincerely,
[Name]
Tips That Make Your Appeal Stronger
- Stick to facts. Leave out anger and personal frustration. Adjusters respond better to clear evidence than to emotion.
- Answer the exact reason for denial. If the claim was denied for “missing documentation”, send exactly that documentation.
- Quote your policy. Use section numbers and exact wording.
- Keep copies of everything — your letter, every enclosure, and proof of when you sent it.
- Send it in a trackable way, such as certified mail with return receipt, or through the insurer’s official portal with a saved confirmation.
- Follow up. If you don’t hear back within the timeframe your insurer states, call and ask for the status, and note the date, time and name of the person you spoke with.
What If Your Appeal Is Denied Again?
You may still have options:
- External review (common for health insurance)
- A complaint to your state’s department of insurance, which regulates insurers
- Mediation or appraisal, which some home and auto policies include for disputes about the amount of a loss
- Speaking with an attorney or a licensed public adjuster for large or complex claims
Frequently Asked Questions
How long does an insurance appeal take?
It depends on your insurer and the type of insurance. Health plans often must decide standard internal appeals within set timeframes (for example, 30 days for services you haven’t received yet and 60 days for services already provided), and urgent cases can be much faster. Your denial letter or policy should state the timeline.
Should I call or write?
Do both if you like, but always put your appeal in writing. A written appeal creates a record and is usually required.
Can someone else write the appeal for me?
Yes. A doctor, family member, attorney or public adjuster can often help or act on your behalf, though the insurer may require you to sign an authorization form.
How long should my appeal letter be?
One to two pages is usually enough. Put the detail in your enclosed evidence, not in a long letter.
Disclaimer: This article is for general information only and is not legal, insurance or financial advice. Rules and deadlines vary by policy and location. For advice about your situation, consult a licensed professional.