Guides · Last reviewed October 20, 2026

How to appeal a UnitedHealthcare claim denial

UnitedHealthcare says you usually have 180 days from your first denial notice to file an internal appeal. If it's denied again, federal rules let you ask for an independent external review within 4 months — and the insurer must follow that reviewer's decision.

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Why it's worth appealing

Across ACA Marketplace insurers, about 19% of in-network claims were denied in 2024, yet patients appealed fewer than 1% of those denials. When people did appeal, roughly one in three internal appeals ended with the denial overturned.

Step 1: Read your denial letter and EOB

Find the claim number, your member ID, the exact reason for the denial, and the appeal deadline. UnitedHealthcare groups most denials into five reasons: eligibility, duplicate submissions, missing documentation (like records or imaging), a service the plan doesn't cover, or care that didn't match its clinical guidelines.

Step 2: Know your deadline (usually 180 days)

UnitedHealthcare states that for most plans you have 180 days from the date of the first denial notice to appeal. Some plans allow more time — check your Summary Plan Description or Certificate of Coverage to be sure.

Step 3: Build your case

You can ask UnitedHealthcare, free of charge, for the documents used to decide your claim, including the specific plan rule or clinical guideline. Then get a letter of medical necessity from your treating doctor explaining your diagnosis, what was tried before, and why this care was needed.

Step 4: File the internal appeal with UnitedHealthcare

There are several ways to start:

Follow the appeal steps printed on your denial letter.
Call the Member Services number on your UnitedHealthcare ID card.
Sign in at myuhc.com or the UnitedHealthcare app.
For a job-based plan, your employer's HR or benefits team can help.

Put the appeal in writing, attach the denial notice, your doctor's letter, and relevant records, keep copies, and send it in a way you can track. UnitedHealthcare generally decides within 30 days for care you haven't received yet and 60 days for care you already got. If waiting could seriously harm your health, ask for an expedited appeal.

Step 5: Request an external review if denied again

If the internal appeal is denied, you can request an independent external review, generally within 4 months of the final denial. An outside reviewer decides — usually within 45 days, or 72 hours for urgent cases — and UnitedHealthcare must accept the result. The federal external review process is free.

Where to get free help

Job-based plan that's self-insured: U.S. Department of Labor, EBSA — 1-866-444-3272.
Job-based plan that's fully insured: HHS Health Insurance Assistance Team — 1-888-393-2789.
Medicare: 1-800-MEDICARE, or see our Medicare appeal guide.

For the general step-by-step that applies to any insurer, see our guide to appealing a health insurance denial.

Common questions

How long do I have to appeal a UnitedHealthcare denial?

For most plans, 180 days from the date of your first denial notice. Check your plan documents, as some plans allow more time.

What if UnitedHealthcare denies my appeal again?

You can request an independent external review, generally within 4 months of the final denial. The outside reviewer's decision is binding on the insurer.

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Sources

Billmira is a self-help information tool, not a law firm, and this isn't legal or medical advice. Billmira is not affiliated with or endorsed by UnitedHealthcare. Rules change and plans differ; check the official sources above and your own documents.