How to dispute a medical bill

Mistakes on medical bills happen, and you are allowed to ask about any charge. Here is the order that works, what to look for line by line, and what to do if the bill has already gone to collections.

Updated October 2026

Step 1: Get the itemized bill

The first bill most people get is a summary: a few totals and an amount due. You can't check a total. Ask the billing office for the itemized bill, which lists every charge with its date, description, billing code, number of units and price. You have a right to your billing records, and the provider must respond within 30 days. Our guide on how to get an itemized bill has the exact wording.

Step 2: Compare it with your insurance statement

If you have insurance, your plan sends an Explanation of Benefits (EOB) for each claim. It is not a bill. It shows what the provider billed, what your plan allowed and paid, and what you may owe. Lay the two side by side and look for:

charges on the bill that the EOB doesn't show at all, which your insurer may never have received;
charges the EOB marks as denied, now billed to you;
a balance on the bill that is higher than the "patient responsibility" on the EOB.

That last one is the most common, and the easiest to show: the two numbers should match once insurance has paid.

Step 3: Read the bill line by line

These are the problems a careful reader looks for. None of them proves a mistake on its own, but each is worth asking about.

Charges billed twice. The same code on the same date, more than once, with nothing (like two units, or "bilateral") to explain it.
Room days that don't match your nights. Hospitals normally bill one room day per night. If you were admitted on the 2nd and went home on the 4th, that is two nights, so two room days.
Dates outside your stay. Charges dated before you were admitted, or after you went home.
Quantities that don't fit. More units of a medicine or supply than makes sense for your visit.
Supplies that are usually included. Gloves, gowns, linens or an "admission kit" billed one by one, when they are normally part of the room or procedure charge.
Emergency visit levels. Emergency visits are billed at levels 1 to 5 (CPT codes 99281 to 99285). Level 5 is for the most complex visits. If yours was simple, it is fair to ask how the level was chosen.
Surprise bills. A bill from an out-of-network doctor for emergency care, or for care at an in-network hospital. Federal law may protect you; see the No Surprises Act.

Billcheck reads your itemized bill and insurance statement for you and marks each line worth asking about. The scan is free.

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Step 4: Call and ask for a billing hold

Call the number on the bill. Say you have questions about specific charges, and ask them to put the account on hold while they look into it, so it isn't sent to collections. Before you hang up, write down the date, the name of the person you spoke to and a reference number. Keep a simple log of every call.

Don't pay the amounts you are questioning yet. Paying the parts you agree with is fine and shows good faith. A correction before you pay is easier to get than a refund after.

Step 5: Put your questions in writing

A phone call is a good start, but a letter is a record. Keep it short and specific: list each charge you question (date, description, code, amount), say what you are asking for (remove it, correct it, or explain it), ask for a corrected itemized bill, and repeat your request for a billing hold. Send it by mail with tracking or through the patient portal, and keep a copy. If you hear nothing in about 30 days, call again and mention the date you wrote.

Step 6: Appeal to your insurer if a claim was denied

If your EOB shows a charge as denied, you can ask your plan for an internal appeal. For most plans, you have 180 days from the denial notice. Ask for the specific reason and the plan rule used. If the internal appeal is turned down, you can ask for an external review by an independent reviewer, usually within 4 months. Your denial letter states your plan's exact deadlines.

Step 7: Ask about financial assistance

If the bill is correct but hard to pay, ask for the hospital's financial assistance policy. Nonprofit hospitals must have one, and many people with modest incomes qualify for free or discounted care. Our guide on hospital financial assistance explains who may qualify and how to apply.

If the bill already went to collections

A collection agency must send you a validation notice that describes the debt. If you dispute the debt in writing within 30 days of getting that notice, the collector must stop collecting until it sends you verification. A phone call does not start that pause, so write. Ask for the name of the original provider, an itemized list of the charges, and the amount they say you owe.

On credit reports, the three big credit bureaus leave out paid medical collections, medical collections under $500, and unpaid ones less than a year old. Larger unpaid medical debts can still appear, so it is worth acting early.

Nonprofit hospitals must also wait at least 120 days after the first bill they send after you leave before taking extraordinary collection actions, such as reporting you to a credit bureau or suing.

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Common questions

Should I pay a medical bill I am disputing?

Pay the parts you agree with if you can, and hold off on the amounts you are questioning until the billing office answers. Ask them to put the account on hold so it is not sent to collections while it is reviewed.

How long do I have to dispute a medical bill?

There is no single deadline for questioning a bill with the provider, so start as soon as you can. Insurance appeals usually must be filed within 180 days of a denial notice. Uninsured or self-pay patients who were billed $400 or more above a Good Faith Estimate have 120 days from receiving the bill to start a federal dispute.

What are the most common mistakes on hospital bills?

Charges billed twice, more room days than nights in the hospital, charges dated after you went home, items your insurer never processed, and a balance higher than your insurer says you owe.

Can a medical bill go to collections while I dispute it?

It can unless you ask for a hold, so ask in writing. Nonprofit hospitals must wait at least 120 days after the first bill after you leave before extraordinary collection actions such as credit reporting. If a collector contacts you, you can dispute the debt in writing within 30 days of its validation notice.

Sources

Billcheck is a medical bill review tool, not a law firm. This guide is general information, not legal or medical advice. Rules vary by state and by health plan.