Medical Billing Dispute Letter
Use this complaint letter template to dispute incorrect or unfair medical bills. Include account number and specific line items.
When to use this letter
Send this when a medical bill includes charges you believe are wrong, such as duplicate billing, services you never received, a coding error, or surprise balance billing. A written dispute puts the billing department on notice and starts the clock on their response.
What to gather
Itemized bill, explanation of benefits (EOB) from your insurer, and any prior correspondence with the provider or billing office.
What to include in your letter
State your account number, the date of service, each disputed line item, and what correction you expect. Keep your tone direct and factual, then ask for a written explanation of the review result.
Sample opening
"I am writing to dispute the following charges on my account (Account # [NUMBER])."
What happens after you send
After your letter is mailed, keep your copy with your supporting records. If the provider or insurer replies, you can use that response to request another review or escalate to a regulator.
Medical billing dispute FAQ
Should I dispute with my provider or my insurer first?
If the issue is the provider's bill, contact the provider billing office first. If the issue is claim handling, include your insurer. Many disputes need both parties copied.
Can this help with surprise balance billing?
Yes. Include the exact charge, why you believe it violates billing rules, and ask for a corrected statement.
What if I already called and nothing changed?
A mailed letter creates a dated paper trail that is stronger than phone notes when you need to escalate.
Related resources
- How to write a complaint letter
- How to dispute a medical bill
- All complaint letter templates
- Insurance appeal template
Letter preview
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