Bill vs EOB
How To Dispute a Bill That Does Not Match Your EOB
When a medical bill does not match your EOB, follow these steps to document, file a dispute, and protect yourself.
Updated August 16, 2026 · 8 min read
Quick answer
To dispute a bill that does not match your EOB, document the discrepancy, send a written dispute to the provider with your EOB attached, and follow up if the provider does not respond. If needed, escalate to your insurer or state insurance commissioner.
Step 1: Document Everything
Before you contact anyone, create a record of the discrepancy.
- 1Print or save your EOB.
- 2Print or save the provider bill.
- 3Write down every line where the amounts differ.
- 4Note dates, claim numbers, and provider names.
Step 2: Send a Written Dispute
Send a letter to the provider billing department by certified mail. Include a copy of the EOB, a copy of the bill, a clear explanation of each discrepancy, and a request for a corrected bill.
Step 3: Follow Up
If you do not receive a response within 30 days, follow up by phone. Document the name of the person you spoke with, the date, and what they said.
Step 4: Escalate if Needed
If the provider does not resolve the dispute, escalate to your insurer. File a formal grievance with the claim number and copies of all correspondence.
Step 5: File a Complaint
If neither the provider nor insurer resolves the issue, file a complaint with your state insurance commissioner or attorney general consumer protection division.
Frequently asked questions
Should I pay the bill while disputing it?
You are not obligated to pay a bill you believe contains an error. However, paying the undisputed portion can prevent collection activity on that portion.
How long does the dispute process take?
Most provider disputes resolve within 30 to 60 days. Insurer disputes typically take 30 days for an initial response.
Do I need a lawyer?
For most billing disputes, no. A clear written dispute with supporting documentation is sufficient.
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