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Your health insurance claim got denied? Don’t take the first no.

Get the free 5-Minute Denial Cheat Sheet — the exact steps to appeal a denied health-insurance claim, hit your deadlines, and send the letter that wins.

Insurers denied about 85 million in-network claims in 2024 — and fewer than 1 in 100 people ever appealed.

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How to appeal a denied health insurance claim

If your health insurance claim was denied, you have the right to appeal it yourself — no lawyer required. For most plans you have 180 days from the denial to file an internal appeal, and if that fails you can request a free, independent external review the insurer must follow. Here are the five steps.

  1. Read your denial letter and find the reasonYour Explanation of Benefits or denial notice states the exact reason your claim was denied and your appeal deadline. Note both — most internal appeals must be filed within 180 days.
  2. Request your claim fileAsk your insurer, in writing, for the specific criteria and documents used to deny the claim. Under federal rules they must give it to you free.
  3. Get a Letter of Medical NecessityAsk your doctor for a letter explaining why the treatment is medically necessary, tied to your diagnosis and the plan’s own coverage criteria. This overturns more denials than any other single document.
  4. File your internal appeal in writingSend a written appeal with your denial letter, the medical necessity letter, and supporting records before the deadline. Keep copies and proof of delivery.
  5. Escalate to an independent external reviewIf the internal appeal is denied, request a free external review by an independent third party whose decision the insurer must follow.

What’s on the free cheat sheet

Your deadlineThe 180-day internal-appeal clock — and how to lock it in today.
Get your fileHow to make your insurer hand over the exact reason & criteria — free.
The winning letterWhy a Letter of Medical Necessity overturns the most denials.
External reviewHow to escalate to an independent reviewer the insurer can’t overrule.

Denied claim questions, answered

Can I appeal a denied health insurance claim myself?

Yes. You do not need a lawyer to appeal a denied health-insurance claim. For most plans you have 180 days from the denial to file an internal appeal, and if that fails you can request a free, independent external review. The free cheat sheet walks you through each step.

How long do I have to appeal an insurance denial?

For most health plans you have up to 180 days (about six months) from the date of the denial notice to file an internal appeal. Your denial letter lists your exact deadline, so check it and act early.

How often do insurance appeals succeed?

Insurers denied about 85 million in-network claims in 2024, yet consumers appealed fewer than 1 in 100. When people do appeal, a meaningful share of denials are reversed — the overturn rate varies by plan and denial type, and rises further at the independent external-review stage.

What should I do first when my claim is denied?

Read your denial letter to find the exact reason code and your appeal deadline, then request your claim file from the insurer in writing. Those two steps set up everything else in your appeal.

What is a Letter of Medical Necessity?

A Letter of Medical Necessity is a letter from your doctor explaining why a treatment is medically necessary, tied to your diagnosis and the plan’s own coverage criteria. It overturns more denials than any other single document.

What is an external review?

An external review is an independent evaluation of your denial by a third party unconnected to your insurer. It is free, and the reviewer’s decision is binding — the insurer must follow it. You can usually request one after an internal appeal is denied.

Does it cost anything to appeal?

No. Filing an internal appeal and requesting an external review are free. You only pay if you choose to buy a done-for-you kit or hire help — neither is required to appeal on your own behalf.

Is Fight Back legal or medical advice?

No. Fight Back provides educational information and templates so you can appeal on your own behalf. Always follow your own denial notice and verify deadlines and rights with your plan and your state’s insurance department.

Free step-by-step guides

How to appeal a denied claim →The full 5-step process, your deadlines, and how to escalate.
Letter of Medical Necessity →What it is, plus a free template to hand your doctor.
Denied medication or procedure →Prior auth, step therapy, and how to push back.
External review explained →The free, binding appeal most people never use.

How to fight a surprise medical bill (No Surprises Act) →

Want the done-for-you version?

The cheat sheet gets you started. The full kit hands you the whole process plus ready-to-send letters — so you just fill in the blanks and send.

The Insurance Denial Appeal Kit

Fight a denied claim — and actually win

A 15-page print-and-fill playbook + 8 editable appeal letters (medical necessity, prior auth, surprise bill, external review, and more).

$27
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Sources & further reading: Denial and appeal figures from the Kaiser Family Foundation (KFF) analysis of 2024 HealthCare.gov claims data. Your appeal rights, the 180-day deadline, and external review are described at HealthCare.gov. Surprise-bill protections come from the federal No Surprises Act. Always verify the specifics for your own plan and state.
Last updated: July 26, 2026 · Reviewed by the Fight Back editorial team, Banana Bay Press
Don’t take the first no.