What to ask when a medical bill does not match your EOB

Ask the provider what they see

Provider billing offices and insurers often look at different systems. A provider may still show a balance because an adjustment has not posted, a payment has not arrived, or the bill was generated before insurance finished processing.

Start by asking what the provider has on file for the account: the insurance payment date, the adjustment amount, the current patient balance, and whether any itemized bill or corrected claim is available.

• Has the insurance payment posted to this account?
• What adjustment is posted from the EOB?
• Is there an itemized bill for the date of service?
• Was a corrected claim sent or requested?

Ask the insurer how the claim was processed

The insurer can usually explain how a claim line became deductible, coinsurance, copay, denied, or out of network. Ask for the claim number, processed date, reason code, and whether the provider needs to submit anything else.

If the insurer says the provider billed incorrectly, ask what the provider should change. If the insurer says the bill is correct, ask which EOB line supports the patient responsibility.

Keep the next action narrow

Broad requests like "please fix my bill" are hard to track. Narrow requests are easier to follow: post the adjustment, send an itemized bill, confirm claim reprocessing, upload a missing document, or call back by a specific date.

After each call, write down the representative name or reference number, the promise made, and when to check again.