Found an error on your medical bill? The next step is a formal dispute. A written letter creates a paper trail, references specific billing codes and regulations, and gives the provider a clear deadline to respond.
Below is a ready-to-use dispute letter template you can copy, fill in your details, and send. We also include a phone script for when you prefer to call first.
The dispute letter template
Copy this letter, replace the highlighted fields with your information, and send it via certified mail (or email if the provider accepts electronic disputes).
[Your Full Name]
[Your Address]
[City, State ZIP]
[Your Phone Number]
[Your Email]
[Date]
[Provider/Hospital Name]
Billing Department
[Provider Address]
[City, State ZIP]
Re: Billing Dispute — Account #[Account Number]
Patient: [Patient Name]
Date(s) of Service: [Date(s)]
Dear Billing Department,
I am writing to formally dispute the following charge(s) on the above-referenced account. After reviewing my itemized bill against applicable federal billing regulations, I have identified the following error(s):
Error 1: [CPT Code] — [Description of the charge]
Issue: [Describe the specific error, e.g., "This code appears twice on the same date of service (duplicate charge)" or "CPT 80048 is an NCCI bundling violation when billed with CPT 80053 — the basic metabolic panel is a subset of the comprehensive metabolic panel"]
Regulatory basis: [e.g., "CMS NCCI Procedure-to-Procedure edits, Column 1/Column 2 pair" or "Medicare Physician Fee Schedule locality rate comparison"]
Amount disputed: $[Amount]
[Repeat for additional errors if needed]
I request that you:
1. Review and correct the above charge(s).
2. Issue a corrected itemized statement within 30 days.
3. Suspend any collection activity on the disputed amount(s) pending resolution.
Pursuant to the Fair Debt Collection Practices Act (15 U.S.C. § 1692g), you are required to verify the validity of any disputed debt before continuing collection. I am exercising my right to dispute these charges.
Please contact me at [phone or email] to discuss resolution. If I do not receive a response within 30 days, I will escalate this matter to my state's insurance commissioner and the CMS No Surprises Act helpline.
Sincerely,
[Your Full Name]
Enclosures:
— Copy of itemized bill with disputed charges highlighted
— Copy of Explanation of Benefits (EOB), if applicable
— [BillError scan report, if applicable]
Before you send: a checklist
- Get the right mailing address. Call the billing department and confirm where written disputes should be sent. Some providers have a specific disputes address or fax number.
- Send via certified mail. This gives you proof of delivery with a tracking number. Keep the receipt.
- Keep copies of everything. Copy the letter, the envelope, the certified mail receipt, and any supporting documents before sending.
- Note the 30-day deadline. Mark your calendar. If you don't hear back in 30 days, follow up with a phone call referencing your letter.
- Don't pay the disputed amount. You have the right to withhold payment on specifically disputed charges while the dispute is being reviewed.
Phone script (for calling first)
Many billing errors can be resolved with a single phone call. Use this script when you call the billing department:
"Hi, I'm calling about account number [number] for a date of service on [date]. I've reviewed my itemized bill and I believe there's a billing error."
"Specifically, I see [describe the error — e.g., 'CPT code 99214 billed twice on the same date' or 'CPT 80048 and 80053 billed together, which is an NCCI bundling violation']."
"Can you review this and let me know if a correction can be made? I'd like to resolve this before I need to submit a formal written dispute."
If they push back: "I understand. I'd like to submit a written dispute then. Can you confirm the mailing address or fax number for billing disputes? I'll also be attaching the relevant NCCI edit documentation."
If they agree: "Thank you. Can I get a reference number for this call, your name, and a timeline for when the corrected bill will be issued?"
What happens after you dispute
- 30-day response window: Most providers respond within 30 days. They must either correct the bill, explain why the charges are valid, or request more information.
- Collection activity paused: Once you've sent a written dispute, the provider cannot send the disputed amount to collections without first verifying the debt.
- If they don't respond: Escalate to your state insurance commissioner, file a complaint with the CMS No Surprises Act helpline (1-800-985-3059), or contact a patient advocate.
- If they partially correct: Review the corrected bill carefully. If additional errors remain, send a follow-up dispute letter for the remaining charges.
Common reasons disputes succeed
- Duplicate charges — Same procedure billed twice on the same date. Nearly always corrected when pointed out.
- NCCI bundling violations — Two codes billed separately that should be bundled. CMS publishes 190,000+ code-pair rules that make these black-and-white.
- Overcharges vs. Medicare rates — Charges significantly above the Medicare fee schedule rate. While providers aren't bound by Medicare rates, extreme markups (300-500%+) strengthen your case.
- Wrong place-of-service code — Outpatient visit billed as inpatient, or office visit billed with facility fee. Easy to verify, hard for providers to defend.
- Balance billing violations — Under the No Surprises Act, you cannot be balance-billed for emergency services or out-of-network care at in-network facilities.
Get a dispute letter with specific citations
BillError scans your bill against 190,000+ federal rules and generates a custom dispute letter with the exact CPT codes, rule violations, and dollar amounts. Much stronger than a generic template.
Scan your bill freeWhen to get professional help
For bills over $5,000 with multiple errors, consider hiring a medical billing advocate. The Medical Billing Advocates of America (MBAA) connects patients with professionals who typically charge 25-35% of savings recovered. For smaller bills, a DIY dispute with a tool like BillError is usually more cost-effective.
For bills you genuinely cannot afford, ask the hospital about their Financial Assistance Policy (FAP) before paying anything. Most nonprofit hospitals are required to have charity care programs that can reduce or eliminate your bill based on income.