Sample letter requesting a refund of a medical bill overpayment

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: Request for a refund of a credit balance
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 writing about the account above.

My records show these payments: [each payment, with its amount and date].
According to my insurer's Explanation of Benefits, my share for this care is [amount].

My account may have a credit balance of [amount]. Please confirm the balance and refund it to me, rather than holding it as a credit for future visits. Please tell me when to expect the refund and how it will be sent.

Please also send me a statement showing the charges, insurance payments, adjustments and my payments on this account. If a state or federal rule sets a time limit for this refund, I would appreciate your following it.

Thank you,
[Your full name]

Why you may have paid too much

Your full name

Your postal address

Where the refund should go. Or leave empty and give an email below.

Your email (optional)

Hospital or provider

Account or statement number

Printed on the bill, often near the top.

Patient, if not you (optional)

Date(s) of service

What you paid

Each payment with its amount and date.

What you actually owe

The credit you think you have

What you paid minus what you owe.

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Before you send it

Check what you paid against your share on the EOB for the same date of service, and ask the billing office for your payment history. The guide Overpaid a medical bill? How to ask for a refund shows how to spot a credit balance and the refund rules that may apply where you live, and How long does a provider have to refund a patient overpayment? lists the state and federal rules we read in the law. If a hospital approved you for financial assistance after you paid, see Refund after hospital financial assistance.

Need the policy or the itemized bill first? The free financial assistance letter and itemized bill letter ask for them.

Not sure your bill adds up? Open it in MedBillCheckup, our medical bill checker. It is read on your device, never uploaded, and a few optional questions look for a payment above your share.

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”)

Call the billing office first if you can, and note the date you sent the letter.

Questions

When might I be owed a refund?

When you paid more than your share: for example, you paid before your insurer processed the claim, paid the same bill twice, your insurer later lowered your share, or a hospital approved you for financial assistance after you paid. Only the provider can confirm what your account shows. Some states set a deadline: in Florida and Texas, for example, 30 days after the provider determines there was an overpayment, under conditions (Florida Statutes 408.12 and 456.0625; Texas Insurance Code 1661.005).

How do I know how much to ask for?

Add up what you paid for the visit, then compare it with your share on your insurer’s Explanation of Benefits (EOB) for the same date, or with your financial assistance approval. The difference may be a credit balance. The letter asks the billing office to confirm it.

What if the billing office does not refund it?

Ask for the reason in writing, and keep your letter and the dates of your calls. If your state sets a refund deadline, name it in a follow-up letter: the guide on patient refund rules lists the ones we read in the law. In Florida, for example, a hospital or other provider licensed by the state’s Agency for Health Care Administration may be fined if it breaks the patient refund rule (Florida Statutes 408.12). Your state attorney general’s consumer protection office can also tell you what applies where you live.

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.

Ask for a refund of a medical bill overpayment: free letter

Sample letter requesting a refund of a medical bill overpayment

Before you send it

Where to send it

How to send it

Questions

Know someone who paid a medical bill twice?