How to Dispute a Medical Bill: Itemized Bill, Appeals, Letters

To dispute a medical bill, start by getting the itemized bill and your billing records, compare them with your insurer's explanation of benefits (EOB) or your good faith estimate, and then take the problem to the place that fits it: the provider's billing office, your health plan's appeal process, the federal No Surprises Help Desk, the federal $400 dispute process for uninsured patients, or the hospital's financial assistance program. Federal law gives you a right to your billing records under HIPAA (45 CFR 164.524) and sets hard deadlines for several of these routes.

The order matters. A wrong charge, a surprise out-of-network bill, a bill far above your estimate and a correct bill you cannot afford each have a different fix, and a few of the deadlines run from the date of the first bill.

Information last verified on October 20, 2026. This article has not been reviewed by a licensed lawyer.

Jurisdiction scope: This article covers the federal rules that shape a medical bill dispute in the United States: HIPAA access to billing records, the No Surprises Act, the good faith estimate dispute process, nonprofit hospital financial assistance under Internal Revenue Code section 501(r), and the federal debt collection rule on unauthorized amounts. State laws on surprise billing, charity care and medical debt vary; the medical bill checker shows each state's rules.

Good faith estimate dispute check

For uninsured and self-pay patients. Compare one provider’s bill with that provider’s estimate.

Estimate from this provider ($)

Billed by the same provider ($)

Date you received the initial bill (optional)

Compare

Source: 45 CFR 149.620; CMS No Surprises Act consumer advocates toolkit

Open the full medical bill checker

Step 1: Note the dates before anything else

Several federal deadlines run from the first bill, not from the day you start arguing about it. Write down the date printed on the first bill and the date you received it.

Step 2: Get the itemized bill and your billing records

A summary bill that says only "hospital services" cannot be checked. Ask the billing office for a fully itemized bill listing each service, supply and drug with its date, code and charge.

If the billing office will not provide it, use your HIPAA right of access. Under 45 CFR 164.524, you have "a right of access to inspect and obtain a copy of protected health information about the individual in a designated record set." For a health care provider, the designated record set includes "the medical records and billing records about individuals maintained by or for a covered health care provider" (45 CFR 164.501).

The provider must act on your request within 30 days of receiving it. It may extend that once, by no more than 30 days, only if it gives you "a written statement of the reasons for the delay" within the first 30 days (45 CFR 164.524). Make the request in writing and keep a copy. For how long providers must keep records, see medical records retention laws by state.

Step 3: Compare the bill with your EOB or estimate

If you are insured, your plan sends an explanation of benefits for each claim. Check that the bill matches it: the same services, the same dates, the same amount listed as your responsibility. A bill asking for more than the EOB says you owe is the first thing to question.

If you are uninsured or paid as self-pay, compare the bill with your good faith estimate, provider by provider.

On either, look for services you did not receive, duplicate lines, wrong dates, and charges billed as out of network for care at an in-network hospital.

Step 4: Call the billing office, then put it in writing

Many errors are fixed by the billing office. Call, explain which lines you are questioning and why, and ask the office to hold the account while it reviews. Write down the date, the name of the person you spoke to and what they agreed to do.

Then confirm it in writing. A phone promise to hold a bill or remove a charge is hard to prove later; a letter or a portal message with a date is not. Keep copies of everything you send and receive.

Step 5: Use the route that fits your bill

A surprise out-of-network bill (insured)

If you got emergency care, care from an out-of-network clinician at an in-network hospital, hospital outpatient department, critical access hospital or ambulatory surgical center, or an air ambulance ride, the No Surprises Act limits what you owe to your in-network cost-sharing. Ask the provider to rebill at that amount.

If the plan processed the claim wrongly, use your plan's appeal process. The No Surprises Act "expands the right to an external review to include consideration of whether a plan's or issuer's adverse benefit determination was made in compliance with the No Surprises Act."

You can also call the No Surprises Help Desk at 1-800-985-3059 (8am-8pm ET weekdays, 10am-6pm ET weekends) or file a complaint with CMS. Ground ambulance bills are outside the federal law; some states cover them, as the balance billing laws by state show.

If your plan is state-regulated, your state insurance department also takes complaints. Examples from the tool's data: the Texas Department of Insurance, the New York Department of Financial Services, and the Colorado Division of Insurance.

A bill above your good faith estimate (uninsured or self-pay)

If one provider's total billed charges are at least $400 more than that provider's expected charges on your estimate, you can start the federal patient-provider dispute process through the CMS dispute portal. Start within 120 calendar days of the first bill. The fee is $25, paid to the dispute resolution entity. People enrolled in Medicare, Medicaid and other federal programs do not get a good faith estimate, so this route is not open to them.

While the dispute is pending, the provider "must not move the bill for the disputed item or service into collection or threaten to do so," should cease collection already under way, and must suspend late fees (45 CFR 149.620). Full details are on the good faith estimate page.

Medicaid or Qualified Medicare Beneficiary coverage

If you have Medicaid, providers in the program must accept the Medicaid payment, plus any cost-sharing the state plan requires, "as payment in full" (42 CFR 447.15). If you are a Qualified Medicare Beneficiary, CMS states that "federal law has prohibited Medicare providers from collecting Medicare Part A and Part B coinsurance, copayments, and deductibles from QMBs." A bill asking for more should go back to the provider with your coverage card.

A correct bill you cannot afford

A dispute does not reduce an accurate bill. Financial assistance can.

Nonprofit hospitals must have a written financial assistance policy that applies to all emergency and other medically necessary care, states who is eligible for free or discounted care, and explains how to apply (26 CFR 1.501(r)-4). They must post it on a website and give free paper copies on request, including in the emergency room and admissions areas.

For a patient eligible under the policy, the hospital may charge no more than "the amounts generally billed to individuals who have insurance covering such care" for emergency and medically necessary care (26 CFR 1.501(r)-5).

You can apply from the day of care until at least the 240th day after the first post-discharge billing statement (26 CFR 1.501(r)-1). If you submit an application in that window, complete or not, the hospital must not start, or take further action on, extraordinary collection actions until it decides whether you are eligible (26 CFR 1.501(r)-6). The hospital decides your application.

These federal rules cover nonprofit (501(c)(3)) hospitals, not for-profit hospitals. Some states set their own income levels for free or discounted care; see hospital charity care for those rules.

Step 6: If the bill is already in collections

Collection does not end your options. A few federal rules matter:

• Extraordinary collection actions by nonprofit hospitals. Under 26 CFR 1.501(r)-6, these include selling the debt, reporting adverse information to credit bureaus, deferring or denying care for nonpayment, and legal actions such as liens, lawsuits and wage garnishment. A nonprofit hospital must wait at least 120 days from the first post-discharge bill and give at least 30 days' written notice before starting them, and a timely financial assistance application pauses them. Deferring or denying care over a past unpaid bill follows a separate notice rule and is not covered by the 120-day wait or the application pause.
• Amounts the law does not allow. The Fair Debt Collection Practices Act, which governs collection agencies and other debt collectors, lists as an unfair practice "the collection of any amount (including any interest, fee, charge, or expense incidental to the principal obligation) unless such amount is expressly authorized by the agreement creating the debt or permitted by law" (15 U.S.C. 1692f(1)).
• Your rights with collectors. The debt collection laws cover disputing a debt with a collector, the statute of limitations on debt explains when old debts become time-barred, and how to stop wage garnishment covers what to do if a court order reaches your paycheck.
• Your credit report. Equifax, Experian and TransUnion state that paid medical collections are not included on credit reports, that medical collections with an initial balance under $500 are not reported, and that unpaid medical collections wait one year before appearing. Those are the bureaus' own policies, not law. See medical debt on your credit report.
• Complaints about collectors. CMS's toolkit points consumers to the Consumer Financial Protection Bureau at (855) 411-CFPB (2372).

Some states add their own limits on medical debt collection, interest or credit reporting. The medical bill checker lists them by state.

Step 7: Use the letter in the tool

The medical bill checker builds a letter asking the provider for an itemized bill and for its financial assistance policy and application, with a line naming your state's charity-care law where one exists. You fill in your own details; the tool collects none. Send it by a method that shows the date it was sent, and keep a copy with your EOB, estimate and call notes.

Related pages

• Medical bills: your rights before you pay
• No Surprises Act: what it covers
• Good faith estimate and the $400 rule
• Hospital charity care
• Medical debt on your credit report
• Debt collection laws

This article provides general legal information about disputing medical bills under federal law in the United States as of October 20, 2026. It is not legal advice. For a specific bill, contact your health plan, the provider's billing office, your state insurance department, or a lawyer licensed in your state.

Last updated: October 20, 2026.

Frequently Asked Questions

What is the first step to dispute a medical bill?

Ask for a fully itemized bill. If the billing office will not provide one, request your billing records under HIPAA, which covers billing records a provider keeps; the provider must act within 30 days, with one 30-day extension if it gives written reasons (45 CFR 164.524).

How do I dispute a surprise out-of-network bill?

If it was emergency care, care at an in-network hospital or surgery center, or an air ambulance, ask the provider to rebill at your in-network cost-sharing under the No Surprises Act, appeal through your plan if the claim was processed wrongly, and call the No Surprises Help Desk at 1-800-985-3059.

Can I dispute a medical bill if I don't have insurance?

Yes. If one provider bills at least $400 more than its expected charges on your good faith estimate, you can start the federal patient-provider dispute process within 120 calendar days of the first bill, for a $25 fee (45 CFR 149.620).

Can a hospital send my bill to collections while I apply for financial assistance?

A nonprofit hospital that receives your application within the application period must not start, or take further action on, extraordinary collection actions until it decides whether you are eligible (26 CFR 1.501(r)-6).

How long do I have to apply for hospital financial assistance?

At a nonprofit hospital, the application period runs from the date of care until at least 240 days after the first post-discharge billing statement (26 CFR 1.501(r)-1).

What if my medical bill is already with a collection agency?

You can still dispute it. Collecting an amount not permitted by law is an unfair practice for a debt collector under 15 U.S.C. 1692f(1), a nonprofit hospital's financial assistance application window may still be open, and you can complain to the CFPB at (855) 411-2372.