How to appeal a medical bill or insurance denial

Seven steps to organize an appeal

1. 1

   Read the bill and EOB side by side

   Match the provider, date of service, procedure descriptions, amounts billed, plan discounts, insurer payments, and patient responsibility. An Explanation of Benefits is not a bill, but it can help reveal a mismatch.

2. 2

   Find the denial or adjustment reason

   Look for a reason code and plain-language explanation. Common categories include missing information, coding issues, lack of prior authorization, medical-necessity questions, out-of-network processing, and duplicate claims.

3. 3

   Confirm the deadline and appeal route

   Use the instructions on the EOB or denial notice. Record the submission deadline, mailing address or portal, required form, and whether the appeal is internal, expedited, or eligible for external review.

4. 4

   Call the insurer and provider billing office

   Ask the insurer what would resolve the denial and request a reference number. Ask the provider to verify coding, resubmit a corrected claim when appropriate, and pause collections while a timely dispute or appeal is under review.

5. 5

   Gather supporting records

   Collect the itemized bill, EOB or denial notice, relevant plan language, referral or authorization, clinical notes or a medical-necessity letter when appropriate, prior correspondence, and proof of timely submission.

6. 6

   Submit a focused appeal

   State what decision you are appealing, why you believe it should change, and the exact remedy requested. Reference attached evidence and keep copies of the complete packet and delivery confirmation.

7. 7

   Track every follow-up

   Record dates, names, reference numbers, promised response dates, and the final decision. If the appeal is denied, review the notice for the next internal level, external review rights, regulator contacts, or financial-assistance options.