To dispute a medical bill, first get an itemized copy and check it line by line against your Medicare Summary Notice (MSN) or plan Explanation of Benefits (EOB). Then tell the provider's billing office, in writing, exactly which charges you're disputing and why, and ask them to hold the account while they review it. If the problem is a coverage denial, the dispute becomes an appeal with Medicare or your plan; if the bill is already with a debt collector, you can dispute it with the collector in writing.
What counts as a reason to dispute a medical bill?
A dispute makes sense when something on the bill doesn't match what happened or what you owe. Common reasons include:
- A service, test, or supply you didn't get.
- The same charge listed twice. See duplicate charges on a medical bill.
- A billing code that doesn't match your visit. See what a CPT code is and how to look one up.
- An amount higher than the "maximum you may be billed" on your MSN.
- Charges your insurance should have paid but wasn't billed for.
- For people in the Qualified Medicare Beneficiary (QMB) program, any Medicare deductible, coinsurance, or copay. Medicare.gov says Medicare providers aren't allowed to bill QMB members for those on covered services.
Common medical billing errors seniors should check for lists more.
Step 1: What should I check before I dispute the bill?
A specific dispute is easier to resolve than a general complaint. Gather:
- The itemized bill. If you only have a summary, ask for an itemized one first. See how to ask for an itemized hospital bill.
- Your MSN or plan EOB for the same dates.
- Any notes, appointment records, or receipts.
Mark each line you think is wrong and write one sentence about why. For example: "Line 7, CT scan on 3/4, I didn't have a CT scan."
Step 2: What do I say when I call the billing office?
Some problems can be fixed with one call. Ask for the account to be put on hold while you sort it out.
What to say:
"I'm calling about account [number] for [patient name]. I'm disputing some charges on this bill. Line [number] shows [charge] on [date], and I didn't receive that service. Line [number] is listed twice. My Medicare notice also shows the maximum I may be billed is $[amount], but your bill says $[amount]. Can you review these, send a corrected bill, and hold the account from collections while you do?"
Write down the name of the person you spoke with, the date, and any reference number. For more call tips, see how to call a medical billing office.
Step 3: How do I put the dispute in writing?
A letter or email creates a record. Keep it short:
- Your name, the patient's name, account number, and dates of service.
- Each disputed line and the reason.
- What you're asking for: a corrected, itemized bill, and a hold on collections.
- Copies (never originals) of your MSN or EOB with the lines circled.
Sample opening:
"I am writing to dispute the following charges on account [number] for services on [date]. I am asking for a corrected itemized bill and a hold on the account until the review is complete."
Send it by a method you can track, and keep a copy.
Step 4: What if insurance denied the claim?
If the bill is high because Medicare or your plan denied coverage, the provider may not be able to fix that alone. That's when a dispute turns into an appeal. Follow the instructions and deadline printed on your MSN or plan denial notice. See how to appeal a Medicare denial, step by step and Medicare appeal help.
Ask the provider whether the denial came from a coding or paperwork problem they can correct and resubmit. That can be faster than an appeal, though it depends on the reason.