How to dispute a medical bill: steps and letter template

You found a charge that looks wrong, or a bill that doesn't match your explanation of benefits (EOB). You don't have to just pay it. You can dispute it, which means asking the provider to review the bill and correct it. This guide walks through each step, from the first call to where to turn if you're stuck. It's part of our guide on how to lower medical bills.

Start with the billing office. You'll only need the later steps if the early ones don't work.

When should you dispute a medical bill?

Dispute a bill when you think it asks for money you don't owe. Common reasons include:

• A charge that appears twice
• A service you didn't get
• A bill that's higher than your share on the EOB
• A payment or insurance discount that's missing
• A code for a more complex visit than you had
• A surprise bill from an out-of-network provider

If the bill is correct but more than you can pay, that's a different path. See hospital charity care and how to negotiate a hospital bill.

Step 1: Pinpoint the problem

Before you call, know exactly what you're disputing. A specific question gets a specific answer.

If your bill shows only totals, ask for an itemized bill. It lists every charge with its date, code, and price. See how to get an itemized bill.

Then compare it with your EOB. Our guide to the EOB vs. medical bill shows how. Our list of common medical billing errors tells you what to look for, from duplicate charges to missing payments.

Write down each line you're disputing, the amount, and why. For example: "March 3, blood test panel, $320, listed twice."

Step 2: Call the billing office

The number is usually on the bill, often under "billing questions" or "patient financial services." Have the bill, your EOB, and your list in front of you.

Here's a short script you can use:

Hi, I'm calling about account number [number] for [patient name]. The date of service is [date]. I compared my itemized bill with my EOB, and I think there's an error. The charge for [service] on [date] is [listed twice, or not on my EOB]. Can you review it and send me a corrected bill? Can you also hold my account while you check?

Before you hang up, ask what happens next and when. Write down the date, the person's name, and any reference number.

If the person agrees it's an error, ask when you'll get the corrected bill. If they say the bill is right, ask them to explain each line you questioned.

Step 3: Ask them to hold your account

Ask the billing office to pause your account while it reviews the dispute. That keeps the bill from going late, or to a collection agency, while you wait. Ask for the hold in writing, or note who agreed to it.

A hold is usually a request, not a right. But some rules do pause collections:

• Financial assistance. Say you apply for financial assistance at a nonprofit hospital. While it reviews a complete application, it must pause serious collection steps, like credit reporting or a lawsuit.
• Good faith estimate disputes. Say you didn't use insurance, and a bill is at least $400 over your good faith estimate. You can file a federal dispute, and the provider can't send the bill to collections while it's open.

Pay any part of the bill you agree with, so that part stays current.

Step 4: Send a written dispute

If a call doesn't fix it, put your dispute in writing. A letter creates a record of what you asked for and when.

Include:

• Your name, the patient's name, and the account number
• The date of service
• Each line you're disputing, the amount, and why
• What you want: a corrected bill, a corrected claim to your insurer, or a refund
• A request to hold the account while they review it
• Copies, not originals, of the bill, your EOB, and any receipts

Send it by certified mail so you can track delivery. You can also use the provider's patient portal if it lets you send messages. Keep a copy of everything you send.

Our letter templates give you the words for each situation.

Step 5: Bring in your insurer if it's a claim problem

Some billing problems start with the claim, not the bill. Your EOB might show a denial, a missing discount, or in-network care processed as out-of-network. The provider can't always fix these alone.

Call the member services number on your insurance card. Ask them to explain the EOB and what the provider needs to do. Sometimes the provider only needs to send a corrected claim. Sometimes you need to file an appeal.

For most private plans, you have 180 days from the denial notice to file an internal appeal. If your plan says no again, you can ask for an external review. Our guide on how to appeal an insurance denial walks through both.

Tell the billing office you're working with your insurer. Ask them to keep the hold in place until the claim is settled.

Step 6: Escalate if you're stuck

If the provider won't fix a clear error, you have places to turn. Which one fits depends on the problem.

• The hospital's patient advocate. Many hospitals have a patient advocate, ombudsman, or patient relations office. Ask the main number for it. It can help you reach the right person.
• Your state insurance department. It takes complaints about insurers. The National Association of Insurance Commissioners lists every state's department.
• Your state attorney general or consumer protection office. It takes complaints about businesses. USA.gov lists each state's office.
• The No Surprises Help Desk. For surprise out-of-network bills, call 1-800-985-3059 or submit a complaint online. Didn't use insurance? If a bill is $400 or more over its good faith estimate, you can dispute it. Start within 120 days of the bill. See good faith estimates.
• The Consumer Financial Protection Bureau (CFPB), if the bill is in collections. Send the collector a written dispute within 30 days of getting its validation notice. It must stop collecting until it sends you verification of the debt. If it doesn't follow the rules, submit a complaint online or call (855) 411-2372. See medical bill in collections.

Step 7: Keep a record of everything

A dispute can take several rounds. A simple log keeps you from starting over each time. Here's what 1 might look like.

Keep the log with copies of every bill, EOB, letter, and receipt. 1 folder for each visit makes it easy to find what you need.

Say Priya had an MRI and a follow-up visit at an in-network clinic. She had met her deductible, so she paid 20% coinsurance. Her EOB said she owed $230, but her bill asked for $2,030.

Service	Amount billed	Allowed amount	Plan paid	Her share on the EOB	Her bill
MRI	$2,800	$1,000	$800	$200	$2,000
Follow-up visit	$400	$150	$120	$30	$30
Total	$3,200	$1,150	$920	$230	$2,030

The gap is $1,800. That's the MRI's network discount: $2,800 billed minus the $1,000 allowed amount. The clinic posted the insurance payment but never took off the discount.

Here's how Priya worked through it:

1. Day 1: She called the billing office, named the missing discount, and asked for a hold. She wrote down the rep's name.
2. Day 15: A new bill came, still asking for $2,030.
3. Day 16: She mailed a dispute letter by certified mail, with a copy of her EOB.
4. Day 20: She called her insurer, which confirmed the $1,000 allowed amount.
5. Day 34: The clinic sent a corrected bill for $230.

Results vary. Some disputes end with 1 call, and others take several letters.

If this doesn't work

If the provider still won't change the bill after your letter and your insurer's help, you still have options:

• Ask for the decision in writing. Ask the provider to explain, line by line, why it thinks the bill is right.
• Go back to your insurer. If your plan agrees with you, ask it to contact the provider directly.
• File a complaint. Use the state and federal offices in Step 6 that fit your problem.
• Look at what you can afford. If the bill turns out to be correct, apply for hospital charity care or ask for a payment plan.
• Don't ignore court papers. If you're sued over a medical bill, talk to an attorney right away.

When to get help

You can handle many disputes yourself with a few calls and a letter. It's worth getting help when:

• The amount is large, or the provider can't explain the charges.
• Your insurer denied the claim, and an appeal deadline is coming up.
• The bill is in collections, or you've been sued.
• You're disputing bills for someone else and you're short on time.

Your insurer's member services team can explain your EOB. Your state's consumer assistance program, if it has one, can help with insurance complaints and appeals. For surprise out-of-network bills, the No Surprises Help Desk answers questions at 1-800-985-3059. A medical bill advocate can take on the calls and letters for you. If you've been sued, talk to an attorney.