A medical bill can have a duplicate charge or a service you never got, and the time to catch it is before you pay. Once the money is gone, getting it back is slower. Here's who can check a bill for you, what each option costs, and how to pick.
Quick answer
Five kinds of people can check a medical bill for errors: you (free, using the itemized bill and your EOB), the hospital billing office (free, but they work for the hospital), your insurer (free, for how the claim was processed), a hospital financial counselor (free, for assistance programs), and a paid bill review service or independent advocate. mediloop is one of the paid options. It costs $129 flat per bill, refunded in full if the bill isn't lowered by at least $129, and you can upload a bill for free first.
Who can check your bill
Nobody checks your bill for you by default. The hospital sends what its system produced, and your insurer pays what the claim says. If there's a mistake, someone has to go looking for it. That someone can be you, or it can be one of these:
- You. Ask for an itemized bill and line it up against your EOB. It's free and it catches the obvious problems.
- The hospital billing office. They'll review a specific charge if you point at it and ask. They won't go hunting for errors on their own.
- Your insurer. Member services can tell you why a claim was paid the way it was and reprocess it if it was wrong.
- A hospital financial counselor. Nonprofit hospitals have to have a financial assistance policy, and counselors help you apply. They don't audit the charges.
- An independent advocate or bill review service. They check the whole bill, deal with the billing office and the insurer, and charge for it.
Your options, side by side
| Who | Cost | Checks the whole bill? | Good for |
|---|---|---|---|
| You | Free | Yes, if you have time | Short bills, clear duplicates |
| Hospital billing office | Free | No, only what you ask about | Fixing one charge you've spotted |
| Your insurer | Free | No, only how the claim was paid | Denied or wrongly processed claims |
| Hospital financial counselor | Free | No | Charity care and payment plans |
| Independent advocate | Hourly or a share of savings | Yes | Large, messy or disputed bills |
| mediloop | $129 flat, refunded if not lowered by $129 | Yes | Anyone who wants it done without the phone calls |
Everything above is the general version. To see what applies to your own bill, upload it to a free mediloop account. An automatic first look reads the charges and shows what looks worth questioning, usually in about a minute. If you want a specialist to take it from there, it is a flat $129, refunded in full if the bill isn't lowered by at least $129.
Check my bill for freeWhat to do before you pay
- Get the itemized bill. The summary statement doesn't show line items. You're entitled to ask for the full list. Here's how to request an itemized bill.
- Wait for the EOB if you have insurance. The bill shouldn't be more than the “patient responsibility” on your EOB. If it is, see what to do when the bill is higher than the EOB.
- Ask for a hold. Call the billing office, say you're questioning charges, and ask them to pause the account so it doesn't move toward collections.
- Write things down. Note the date, the name of who you spoke to and what they said.
What a bill check looks for
- Duplicate charges, the same item or service billed twice. See how to find and remove duplicate charges.
- Things you didn't get, like a medication that was ordered and then cancelled.
- Unbundling and upcoding, where parts of one service are billed separately or a visit is coded at a higher level. More in upcoding and unbundling.
- Insurance mistakes, like a claim that was never sent, sent with the wrong details, or processed out of network when it shouldn't have been.
- Missing discounts, such as a self-pay discount or financial assistance you qualify for but were never offered.
Our list of common medical billing errors goes through each one with examples.
Which option fits your bill
If the bill is short and you can see the problem, call the billing office yourself. That costs nothing and often fixes it in one call. If the issue is how insurance paid, start with your insurer. If money is tight, ask about financial assistance first, because it can wipe out a large part of the bill no matter what else is on it. Use the charity care checker to see if you might qualify.
Paid help makes more sense when the bill is large, has a lot of lines, involves more than one provider, or you've already tried and got nowhere. Before you pay anyone, check how they charge and what happens if the bill doesn't come down. Our guide to medical bill advocates covers what to ask.
Where mediloop fits
With mediloop you upload the bill and our AI goes through every line, checking for duplicates, coding problems, insurance issues and assistance you might qualify for. A human advocate is on every case. They look over what was found and handle the billing office and the insurer for you.
You can upload a bill for free and see a first look before paying anything. If you want us to take the case, it's $129 flat per bill, and if the bill isn't lowered by at least $129 you get the full $129 back. Bills already in collections work differently, so get in touch first if that's where yours is.
About mediloop
mediloop (mediloop.ai) is a specialist-led medical bill review and negotiation service for people in the United States. Customers create an account and upload the bill and an explanation of benefits, if available. A specialist reviews the documents and handles the supported provider conversations. Pay Per Bill is $129 and the Annual Plan is $499 for up to six household bills. Prices are flat, never a percentage of savings. The $129 Pay Per Bill fee is refunded in full if the bill isn't lowered by at least $129. mediloop is an independent US company and is not connected to other businesses that use a similar name.
Sources
- CMS, How to read your medical bill
Explains what each part of a medical bill means and says to compare the bill with the explanation of benefits, which can arrive separately for each provider or facility involved in one episode of care, to make sure the amounts are correct before paying.
- CMS, How to read an explanation of benefits
An explanation of benefits shows the total charges for a visit and is explicitly not a bill; it shows what the plan covered and what you will owe when the provider invoices you.
- CMS, Dispute a medical bill (patient-provider dispute resolution)
You can dispute if a provider or facility charged at least $400 more than their good faith estimate and the initial bill is dated within the last 120 calendar days; filing costs a $25 non-refundable administrative fee, deducted from what you owe if the dispute resolves in your favor, and the provider cannot move the bill into collections or threaten to do so while the dispute is pending.
- IRS, Requirements for 501(c)(3) hospitals (section 501(r))
Sets the four obligations on charitable hospitals: community health needs assessment, financial assistance policy, limitation on charges, and billing and collections.
- Patient Advocate Certification Board, BCPA eligibility
To sit the Board Certified Patient Advocate exam a candidate needs two letters of recommendation, a self-assessment, and either a bachelor's degree or documented equivalent advocacy experience.
Sources last checked 29 October 2026. Medical billing rules change, so if you spot something out of date, tell us and we will correct it.
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