How to Dispute a Medical Bill That Is $400 Higher Than Your Good Faith Estimate

In the United States, uninsured and self-pay patients may qualify to dispute a bill that is at least $400 higher than the provider's good faith estimate.
You generally must file within 120 calendar days of the initial bill and provide the estimate, bill, provider details, and a $25 non-refundable administrative fee.
The federal process does not apply if you used insurance for the service; insured patients usually need to appeal through their health plan or submit a No Surprises Act complaint instead.

What the medical bill dispute process does

If you received a medical bill that is at least $400 higher than your good faith estimate, you may be able to use the federal Patient-Provider Dispute Resolution process. An independent third party reviews the estimate, the bill, and supporting information before deciding the appropriate amount you should pay.

This process is part of the U.S. No Surprises Act. It is for people who did not have health insurance or chose not to use insurance for the care. It is not a general appeal system for every medical bill, and it does not apply in Canada.

The most important deadline is 120 calendar days from the date on your initial bill. Because the window is relatively short, gather your documents and check your eligibility as soon as the bill arrives.

Who can dispute a bill that is $400 higher?

CMS says you generally need to meet all of these conditions:

You did not have health insurance when you received the care, or you chose not to use your insurance.
You told the provider before receiving care that you were not using insurance to pay.
The care happened on or after January 1, 2022.
You received a written good faith estimate from the provider or facility at least three days before the scheduled appointment.
Your initial bill is dated within the last 120 calendar days.
At least one provider or facility charged $400 or more above its own estimate.

The comparison is made provider by provider. For example, a surgeon’s estimate is compared with the surgeon’s bill, while a hospital estimate is compared with the hospital’s bill. A higher combined total does not automatically qualify if no individual provider or facility is at least $400 over its estimate.

What if you used insurance?

If your health plan processed the claim, you generally cannot use this self-pay dispute process. Instead, review the explanation of benefits, follow your plan’s appeal instructions, and check whether the bill involves an out-of-network emergency service or out-of-network care connected with an in-network facility.

A deductible-related bill is not automatically a No Surprises Act violation. Medicare, Medicaid, TRICARE, Veterans Affairs health care, and Indian Health Service programs also have their own protections and complaint routes.

Check the estimate against the bill

A good faith estimate is an expected-charge document, not a final bill. It may list the services, facility charges, and other expected items for one provider or facility. If several providers were involved, you may have needed more than one estimate.

Before filing, compare the documents line by line. Look for differences in the provider name, service date, procedure description, units, facility fees, and total expected charges. Save the original estimate and bill as PDFs or clear photographs, and keep copies of anything you submit.

Document	Why it matters
Good faith estimate	Shows the expected charges used for the comparison.
Initial medical bill	Shows the billed amount and starts the 120-day filing window.
Provider contact information	Allows CMS and the reviewer to identify the provider or facility.
Supporting records	Can clarify payments, corrected bills, or disputed services.

If you never received a written estimate, you may not be able to start the formal dispute process. You can still report a possible failure to provide an estimate and ask the provider for an itemized bill or financial assistance.

What to prepare before filing

Have these items ready before opening the dispute form:

A digital or paper copy of the good faith estimate.
A copy of the medical bill you want to dispute.
The provider’s or facility’s name, address, phone number, and contact person if available.
The dates of care and the date shown on the initial bill.
A short explanation of why the bill is at least $400 higher than the estimate.
A way to pay the $25 non-refundable administrative fee.

The process does not begin until the fee is paid. CMS says online payment may be made by credit card, PayPal, or Venmo. If you file by mail, payment must be made with a money order or cashier’s check; cash and personal checks are not accepted.

If the dispute is decided in your favor, the $25 fee is deducted from the amount you owe the provider. If you and the provider settle before the process ends, the provider must reduce the bill by at least $12.50 and notify the independent reviewer.

How to file the dispute

Use the official CMS dispute page to confirm eligibility and start the Patient-Provider Dispute Resolution process. The online form may reset after 15 minutes of inactivity, so have your documents nearby before you begin.

Start the official CMS medical bill dispute process

Confirm that you did not use insurance and that the bill is within the 120-day filing period.
Enter the provider, service, bill, and good faith estimate information requested by CMS.
Upload or submit copies of the estimate and bill. Do not send original documents.
Pay the $25 administrative fee using an available online payment method, or follow the mailed-form instructions.
Save the confirmation, payment record, and copies of every document submitted.

After the dispute is accepted, a dispute resolution entity reviews the information. The provider may be asked for its copy of the estimate, the bill, and documents explaining why the charge was higher. You and the provider can still negotiate while the review is pending.

Can the provider send the bill to collections?

While the dispute is active, the provider or facility generally cannot move the bill into collections, threaten to do so, collect late fees on the unpaid amount, or retaliate against you for using the process. If the bill was already in collections, the provider must pause collection activity while the dispute is being resolved.

Keep written proof that you filed, including the submission date and confirmation number. If a debt collector contacts you anyway, explain that the bill is under a Patient-Provider Dispute Resolution review and keep copies of the communication. You can also report a problem through the CMS No Surprises Help Desk.

What happens after the decision?

The independent reviewer may leave the bill unchanged, require the provider to reduce it, or determine another appropriate payment amount. The dispute itself should not increase your costs. However, it does not guarantee that the final amount will be reduced.

If you reach an agreement with the provider, make sure the settlement is in writing and clearly states the amount due, payment deadline, and whether the account will be withdrawn from collections. If the provider continues billing you or sends the account to collections after a favorable decision, use the CMS complaint route rather than ignoring the notices.

Common exceptions and safer alternatives

Emergency care may not come with a good faith estimate, so the estimate-based dispute process may not fit. The same is true if the bill is outside the 120-day window, the charge is less than $400 over the estimate, or the care was billed through insurance.

In those situations, request an itemized bill, ask the provider’s billing office to review coding or duplicate charges, and apply for financial assistance if available. If insurance was used, follow the appeal instructions in your plan documents and explanation of benefits. For a suspected No Surprises Act violation, use the official CMS complaint page.

The safest next step is to compare the initial bill with the correct provider’s estimate today. If every eligibility condition matches, start the CMS process before the 120-day deadline and keep a complete record of your submission.

Helpful Links

CMS Dispute a medical bill – Check eligibility, prepare documents, pay the administrative fee, and start a Patient-Provider Dispute Resolution case.
CMS Know your medical bill rights when not using insurance – Review good faith estimate rules, provider responsibilities, the 120-day deadline, and self-pay protections.
CMS Submit a complaint – Report a possible No Surprises Act violation or a provider billing problem after a dispute.
CMS Know your rights with insurance – Review the separate protections and appeal options that may apply when insurance processed the claim.

Frequently Asked Questions

Q. Does the $400 difference have to be on the entire medical bill?

A. No. At least one provider or facility must have charged $400 or more above that provider’s or facility’s own good faith estimate. A combined total from multiple providers does not automatically qualify.

Q. Can I dispute a bill if I had insurance but chose not to use it?

A. Possibly. The federal process can apply when you chose not to use insurance, but you must have told the provider before care and meet the other requirements, including having a written good faith estimate and filing within 120 calendar days.

Q. What if I lost my good faith estimate?

A. Ask the provider or facility for another copy in writing. The formal dispute process generally requires the estimate, so do not assume a verbal quote or an estimate recreated after billing will be enough.

Q. Is the $25 administrative fee refunded?

A. It is non-refundable as a separate payment. If the dispute is decided in your favor, CMS says the $25 is deducted from the amount you owe the provider. If you settle before the decision, the provider must reduce the bill by at least $12.50.