How to Fight an Insurance Claim Denial

A denial is the insurer’s first answer, not the last word. Most denials can be challenged in writing, and a clear, well-organized letter that answers the stated reason for denial gives you the best chance of getting the claim reviewed again. This guide covers the process that works across insurance types and how to structure the letter.

Deadlines and legal rights differ by state and by type of coverage, so use this page for the process and your state guide for the specific rules.

The process, step by step

1. Read the denial and note the dates. Find the exact reason the insurer gives, the policy provision it relies on, the date of the letter and the date you received it. Every deadline in your policy and under the law runs from those dates.
2. Get the claim file and the policy. Request a complete copy of your policy and everything the insurer relied on: adjuster notes, estimates, medical or engineering reports and correspondence. For health plans governed by ERISA, you are entitled to reasonable access to and copies of all documents relevant to your claim, free of charge (29 CFR § 2560.503-1(h)(2)(iii)).
3. Match the denial to the policy language. Compare the reason for denial with the actual coverage grant, exclusions and exceptions. Many denials rest on an exclusion that does not fit the facts, or on an incomplete investigation.
4. Gather your evidence. Collect photos, receipts, repair or contractor estimates, medical records, a doctor’s letter, expert opinions and anything showing the timeline. Evidence that directly answers the insurer’s stated reason carries the most weight.
5. Write the appeal or demand letter. Follow the structure below, send it by a method that proves delivery, and keep a copy of everything. Stay factual and specific.
6. Track the deadlines and escalate. Note the insurer’s response deadlines, follow up in writing, and use the next step if the answer is no: an internal appeal, an independent external review for health claims, a complaint to your state insurance department, appraisal for amount-of-loss disputes, or an attorney.

How to structure the letter

1. Heading: your name and address, the insurer, the policy and claim numbers, the date of loss or service and the date of the denial.
2. Purpose: one sentence saying you are appealing or disputing the denial of the specific claim.
3. The reason for denial: quote or summarize what the insurer said, so your response is tied to it.
4. Why it is wrong: respond point by point with the policy language and the facts, and refer to each attached document.
5. What you want: the exact payment, repair, coverage decision or re-review you are requesting, and a reasonable response date.
6. Records request and reservation of rights: ask for the claim file and state that you reserve all appeal and review rights.
7. Enclosures and delivery: list your exhibits and send the letter by certified mail with return receipt or another trackable method.

Choose your state guide

State insurance law controls deadlines for insurers, interest and penalties, bad faith remedies and how to complain to your insurance regulator. Open the guide for your state:

Health insurance denials

Health plans have their own federal appeal timelines, including a minimum of 180 days to appeal under the ERISA claims rule (29 CFR § 2560.503-1(h)(3)(i)). See the guide to health insurance denial appeal deadlines for the full set of internal appeal and external review deadlines.

Frequently asked questions