Appeal letters
How to Write an Insurance Appeal Letter for a Medical Necessity Denial
A medical necessity denial means your plan decided the care was not needed, or not needed yet, based on its own guidelines. A strong appeal letter does three things: it answers the exact reason in the denial, it shows how your records meet the plan's own criteria, and it asks for a clear decision. Below you will find the steps, what to attach, and a sample letter you can copy.
The short answer
- Quote the denial reason and answer it point by point.
- Include a letter of medical necessity from your doctor.
- List treatments you already tried and how they went.
- Attach records that prove each point, and send it before your deadline.
How to write your appeal letter, step by step
- Read the denial reason word for word.
Find the sentence that explains why the plan said no. Look for the name or number of any guideline or coverage policy it mentions. Your letter should respond to that exact reason, not to the denial in general.
- Ask for the policy the plan used.
Call the number on the notice and ask for a copy of the clinical guideline or coverage policy behind the decision. Once you can see the list of requirements, you can show the plan how you meet each one.
- Ask your doctor for a letter of medical necessity.
The best doctor letters are short and specific. They state the diagnosis, how long you have had it, what has already been tried, why this treatment is the right next step, and what is likely to happen without it.
- Gather your proof.
Pull office notes, test results, imaging, lab reports, pharmacy records, and anything that shows earlier treatments did not work or caused side effects. Published medical guidelines that support the treatment can help too.
- Write the letter in a clear order.
Start with who you are and what you are appealing. Then quote the denial reason, explain your medical history briefly, show how you meet each requirement, list your attachments, and end with a direct request to approve coverage.
The free AppealRN builder asks you a few questions and puts these parts together for you.
- Check your deadline and send it.
Deadlines depend on your type of coverage. Most job based and Marketplace plans allow 180 days, Medicare Advantage allows 65 days, and Medicaid managed care plans allow 60 days. Use the address on your notice, keep copies, and keep proof of the date you sent it.
- Follow up and know your next step.
Call the plan about a week after sending to confirm they received it. If the plan keeps the denial, you usually have another level, such as an external review for private plans or a state fair hearing for Medicaid.
Skip the blank page
AppealRN turns your answers into a finished medical necessity appeal letter, figures out your deadline, and gives you a checklist of what to attach. It is free.
Build my free appeal letterSample medical necessity appeal letter
Replace every item in brackets with your own details. Delete any line that does not apply to you. Keep the tone calm and factual.
[Your Full Name]
[Street Address]
[City, State ZIP]
[Phone Number]
[Email Address]
[Date]
[Insurance Company Name]
Attn: Appeals Department
[Appeals Address or Fax Number from Your Denial Notice]
Re: Request for Appeal of Medical Necessity Denial
Member name: [Patient Name]
Member ID: [Member ID Number]
Claim or reference number: [Claim or Authorization Number]
Date of denial notice: [Date on Denial Notice]
Service denied: [Name of Treatment, Test, Drug, or Equipment]
To the Appeals Department:
I am writing to appeal your decision dated [Date on Denial Notice] denying coverage for [Name of Treatment]. Your notice states that this service was denied because [Copy the Exact Denial Reason]. I am asking you to reverse this decision and approve coverage.
I have been diagnosed with [Diagnosis] since [Month and Year]. My doctor, [Doctor Name and Specialty], prescribed [Name of Treatment] because [Plain Reason the Treatment Is Needed].
This treatment is medically necessary for me. Before this request, I tried [Earlier Treatment One] for [Length of Time], which [Result, such as did not help or caused side effects]. I also tried [Earlier Treatment Two] for [Length of Time], which [Result]. Without [Name of Treatment], my doctor expects [What Is Likely to Happen Without It].
Your own coverage policy, [Policy Name or Number], lists the following requirement: [Criterion from the Policy]. My records show that I meet this requirement because [How Your Records Show It]. [Repeat for Each Criterion, or Explain Why the Policy Does Not Fit Your Situation].
I have enclosed the following documents in support of this appeal:
1. A copy of the denial notice dated [Date]
2. A letter of medical necessity from [Doctor Name]
3. Office notes from [Dates of Visits]
4. [Test Results, Imaging, or Lab Reports]
5. [Records of Earlier Treatments Tried]
Please also send me a copy of the clinical guideline or policy you used to make this decision and the records you reviewed. [If urgent: My doctor has stated that waiting the standard time could seriously harm my health. I am requesting an expedited review.]
Thank you for your review. Please contact me at [Phone Number] or [Email Address] if you need anything else.
Sincerely,
[Your Signature]
[Your Printed Name]
[If writing for someone else: Your Relationship to the Patient]
Common mistakes to avoid
- Writing about how unfair the denial feels instead of answering the stated reason.
- Sending a letter with no doctor letter or medical records attached.
- Leaving out the member ID or claim number, which can slow things down.
- Forgetting to list treatments you already tried.
- Missing the deadline because you were waiting on records. Send what you have, note that more is coming, and follow up.
What your doctor's letter should cover
Share this list with your doctor's office: your diagnosis and when it started, the treatments tried and the results, why this treatment is needed now, how it fits accepted medical guidelines, and the risk of delaying or denying it. Offices that handle appeals often have a template, so it is fine to ask.
Frequently asked questions
What should a medical necessity appeal letter include?
Include your name, member ID, claim or reference number, the date of the denial, the service denied, the exact denial reason, a short medical history, the treatments you already tried, how you meet the plan policy, a list of attachments, and a clear request to approve coverage.
Should I write the appeal letter or should my doctor?
Both help. Your letter makes the formal request and ties everything together. Your doctor's letter of medical necessity gives the clinical reasons the plan needs to see.
How long should an appeal letter be?
One to two pages is usually enough. Keep the letter focused and let your attached records carry the detail.
How long do I have to send my appeal?
It depends on your coverage. Most job based and Marketplace plans allow 180 days, Medicare Advantage allows 65 days, Original Medicare allows 120 days, and Medicaid managed care plans allow 60 days. Always use the deadline printed on your own notice.
What if my appeal is denied?
You usually have another level. Job based and Marketplace plans offer an external review by an independent reviewer. Medicare Advantage plans send the case to an Independent Review Entity automatically. Medicaid members can ask for a state fair hearing.
Can I use this sample letter as it is?
Use it as a starting point. Replace every bracketed item with your own details and remove anything that does not apply. A letter that speaks to your exact denial reason is stronger than a general one.
Keep reading
Sources
This is educational information, not legal advice. Always check the deadline printed on your own denial notice.