Sample medical bill dispute letter

It fills in as you type. Anything you leave empty stays in brackets, so you can see what is still missing.

[Your full name]
[Your address or email]

November 10, 2026

Billing Department
[Hospital or provider name]

Re: Questions about my bill
Account or statement number: [number on your statement]
Patient: [Your full name]
Date(s) of service: [dates of your visit or stay]

Dear Billing Department,

I am reviewing my bill and have questions about these charges:

1. [A charge from your bill: its description, date and amount]

For each one, please explain the charge and send me the documentation behind it. In particular, please tell me:
- what service, supply or medication it is for, and on which date;
- its billing code and the number of units.

Please note on my account that these charges are under review, and hold the account from collections while you answer. Please send your answer in writing, and a corrected statement if anything changes.

Thank you,
[Your full name]

Remind me on

30 days from today to start with. Change it if you like.

It reminds you at 9 in the morning on that day. The calendar file says “A date for your medical bill” and links to MedBillCheckup. It names no provider, amount or person, and nothing you type here is sent to us.

Not sure which charges to ask about?

The free check counts them and names the first. Open your bill in MedBillCheckup: it is read on your phone or computer, never uploaded, and the free check shows how many things on it are worth asking about. The full list, with the exact questions to ask, is $6.99 for one bill, or included with Pro at $9.99 a month. It names those lines and the reason for each, with a letter for the billing office that you can edit.

Check my bill, free

Where to send it

Use the address for billing questions or correspondence, not the “remit to” or payment address: it is for payments, and a letter sent there may not reach the people who answer questions. If the bill gives only a payment address, call the number on the bill and ask where written questions go.
If a collection agency has the bill, write to the address on its notice, before the date the notice gives. (CFPB rule, 12 CFR 1006.34)
For your insurer, use the address on the denial notice or the Explanation of Benefits (EOB).

How to send it

A message in the patient portal, or an email: free, and dated. Ask for a written answer.
A fax: free online fax services exist. Keep the confirmation page.
Certified Mail with an electronic return receipt, bought at a post office: $9.28 in all. That is $5.55 for Certified Mail, $2.91 for the receipt and $0.82 postage for a 1 oz letter. A paper green card costs $4.65 instead of $2.91. The receipt is proof it arrived. (USPS Notice 123, prices from October 4, 2026; USPS, Certified Mail basics)
Certified Mail nobody collects is held at the post office for 15 days, then returned to you. USPS keeps its record for 2 years. (USPS, Certified Mail basics; USPS, tracking basics)
A Certificate of Mailing proves the day you sent it, not that it arrived: $2.45 plus postage, $3.27 in all. (USPS Notice 123, prices from October 4, 2026)
Keep a copy of your letter and your proof. Send copies of documents, never originals. (CMS: “Don’t mail any original documents”)

After you send it

Whether to pay while you wait for an answer is your decision. The letter asks the office to hold the account, and only the office decides.

Not sure which lines to list? The common kinds are in medical bill mistakes to check.

How a dispute works from the start, with the calls to make first: How to dispute a medical bill. If the office says no, what to ask next and the usual next official step for your situation: What to do if the billing office says no.

No itemized bill yet? The free itemized bill letter asks for one. If your insurer denied a claim, the free claim file letter asks the plan for the documents behind its decision. If a collection agency has the bill, write to the agency too: our free letter to a collection agency. Can’t pay it? The financial assistance letter asks the hospital for its policy and the application form.

Questions

What is a medical bill dispute letter?

A written request to the billing office about charges on your bill. This one asks questions: what each charge is for, and the documentation behind it. It quotes no law and makes no accusation, so the office can simply answer. Only the provider or your insurer can confirm a change to a bill.

Should I pay the bill while I wait for an answer?

That is your decision. The letter asks the billing office to note the charges as under review and to hold the account from collections while it answers. That is a request: only the billing office decides.

Which charges should I ask about?

Any charge you do not understand. Some to look at: a charge that appears twice, a total that does not match the lines, a charge your insurer’s Explanation of Benefits (EOB) shows differently, and a supply or medicine priced far above what you expected. The free check counts the things on your bill worth asking about; the full list, which is paid, names them.

What if the billing office says no?

The free guide What to do if the billing office says no has what to ask next and the usual next official step for your situation, with its deadline rule and where to go. If a collection agency already has the bill, write to the agency too: our free letter to a collection agency.

Is this legal advice?

No. The letter asks questions and quotes no law. For advice about your own situation, a legal aid office or a lawyer can help.

MedBillCheckup provides informational assistance only. It does not determine whether a charge is medically necessary, fraudulent, illegal, or definitively incorrect, and it is not a substitute for advice from a lawyer, doctor, insurer, or certified medical billing specialist.

Questions about my bill: a free medical bill dispute letter