Medical bill error glossary
This glossary explains the medical-billing errors we check for — duplicate charges, code-pair bundling, upcoding, EOB-rejected charges, self-pay overcharges, and missing financial-assistance discounts — in plain English. Each term answers a common question about what the error is and how to spot it on your own hospital bill.
Paid audits are available only in certain care states. See the current active-state list.
- What are duplicate charges on a medical bill?A duplicate charge is when the same service, item, or billing code appears more than once on your bill for the same date — so you are charged twice for one thing. It often happens by accident when systems re-enter a line, and it is one of the most common medical-billing errors to check for.
- What is code-pair bundling on a medical bill?Code-pair bundling is when two procedure codes that federal coding rules say should be billed together as one are instead billed separately, which can raise your total. Medicare's coding edits list specific code pairs that normally should not be reported on the same day for the same patient.
- What is upcoding on a medical bill?Upcoding is when a bill uses a code for a more expensive or more severe service than the care you actually received. Because the code drives the price, an inflated code inflates the charge. Comparing the codes on your itemized bill to what happened in your visit can reveal a mismatch.
- What are EOB-rejected charges on a medical bill?A charge your EOB says was denied, disallowed, or adjusted may need a closer look if the provider also bills you for it. An EOB is not a bill. Compare the EOB patient balance with the provider bill, then ask the insurer and provider who is responsible for any difference.
- What are self-pay overcharges on a medical bill?A self-pay charge is worth checking when it differs from a hospital’s posted discounted cash price or a good faith estimate you received. Confirm that the posted price applies to your service and circumstances before deciding whether the bill needs correction.
- What are missing financial-assistance discounts on a medical bill?A missing financial-assistance discount is when you qualified for a hospital's charity-care or financial-assistance program but the discount was never applied to your bill. Nonprofit hospitals must maintain a written financial-assistance policy, and patients are often billed full charges without being screened for the help they were eligible to receive.
Related guides
- How to read an itemized medical bill
- How to compare a medical bill with an EOB
- How to question a suspected medical billing error
Want to know what the law says where you live? See our state-by-state guides to your medical billing rights.
Not sure if this is on your bill?
The scan is free. We check every line against federal billing rules and show you, in plain English, what looks wrong — you only pay if you decide you want the dispute package.