Sample Letter to Dispute a Duplicate Charge on a Medical Bill

When is this letter the right tool?

Use this letter when the same service, supply or procedure appears more than once on your bill and you cannot find a reason for it. A typical example is a $400 charge listed twice on the same date of service, or a lab panel billed on two lines with identical descriptions.

Before sending it, make a quick phone call to the billing office. Some repeats are legitimate, such as two separate imaging studies or a repeat test ordered by the doctor. If the biller cannot explain the second entry, put your request in writing.

How do you customize the letter?

The sample below uses bracketed placeholders in capital letters. Replace every one before sending, and delete any sentence that does not fit your situation. Short, specific letters tend to be read and routed faster than long ones.

• The account number and date of service should match the bill exactly, including any statement or invoice number.
• The amount should be the amount of the repeated line only, not the whole balance.
• Name the line item the way it appears on the bill, so the reviewer can find it.
• If you have an EOB, quote the patient responsibility figure it shows.
• Use the provider's billing department address printed on the statement.

What should you attach?

Send copies, never originals. Highlight the repeated lines on your copy of the bill so nobody has to hunt for them. If the first statement was a summary, include it, but also ask for an itemized version, since duplicates are easier to prove line by line.

• A copy of the bill or statement with the repeated charge highlighted
• The EOB from your insurer for the same date of service, if one exists
• Notes from any phone calls: date, time, name of the person, and what they said
• Your payment receipts, if you already paid part of the balance

How should you send it?

Use a method that creates a record, such as certified mail with a return receipt, a patient portal message you can screenshot, or a fax confirmation. Keep a copy of the letter and write down the day you sent it.

Many providers and collectors expect disputes within a short window printed on the bill, so act promptly. If a due date is close, ask in the letter that the account be placed on hold while the charge is reviewed.

What happens after you send it?

The letter asks for a response within 10 business days. A reasonable outcome is a corrected statement that removes the repeated line, or a written explanation of why both entries are valid. If you get an explanation, compare it with your itemized bill and EOB.

If nothing arrives, follow up by phone and note the call. You can then escalate to a billing supervisor or patient advocate, and if the issue involves your insurer's payment, to your plan's appeal process. Medical Bill Dispute Pro produces a letter in this format, with a Basis for Dispute section built from the errors you confirm, but you should always review it before sending.

Sample letter

[YOUR NAME]
[YOUR ADDRESS]
[CITY, STATE ZIP]
[PHONE / EMAIL]

[DATE]

[PROVIDER NAME]
Attn: Billing Department
[PROVIDER BILLING ADDRESS]

Re: Dispute of duplicate charge
Patient: [PATIENT NAME]
Account number: [ACCOUNT NUMBER]
Date of service: [DATE OF SERVICE]

To the Billing Department:

I am writing to dispute a charge on the statement dated [STATEMENT DATE]. The line item [DESCRIPTION OF CHARGE] for [AMOUNT] appears two times for the same date of service. I have no record of receiving this service twice, and I ask that you review the account.

Specifically, I request that you:

1. Verify whether the service was performed and billed more than once.
2. Remove any duplicate entry and send me a corrected statement.
3. Send me a complete itemized bill showing dates of service, descriptions, quantities and billing codes.
4. Place the account on hold, and refrain from sending it to collections, while this review is in progress.

I have enclosed a copy of the statement with the repeated charge highlighted and [AN EOB FROM MY INSURER / NO EOB IS AVAILABLE]. Please respond in writing within 10 business days of receiving this letter. If you believe both charges are correct, please explain why and provide supporting documentation.

I reserve the right to take further steps, including contacting my insurer and the appropriate state regulator, if the matter is not resolved.

Sincerely,

[YOUR NAME]
[YOUR PHONE NUMBER]

Replace every [BRACKETED] placeholder before sending, and keep a copy plus proof of delivery.

Frequently asked questions

Sources and further reading

• CMS: Medical bill rights
• CMS No Surprises Help Desk information

Related guides

• Duplicate Charges on a Medical Bill: How to Spot Them and Dispute ThemBilling errors
• How to Request an Itemized Medical BillHow-to guides
• How to Write a Medical Bill Dispute LetterHow-to guides
• Billed After Insurance Already Paid: What to Check and What to DoBilling errors
• Medical Bill Dispute Checklist: Documents, Calls, and TimelineHow-to guides

Not legal or medical advice. Medical Bill Dispute Pro is a software tool that helps you prepare billing dispute letters. It is not a law firm, does not provide legal advice, and cannot guarantee any outcome. Laws and rules change and vary by plan and state; verify important details with the sources linked above, your insurer, or a qualified professional.