Medical Billing Errors: How to Find Them and Get Your Money Back

You paid the bill. You trusted the number. You moved on.

You probably should not have.

Studies consistently find that 49% to 80% of medical bills contain errors. Almost none of those errors are in your favor. Hospitals have entire departments dedicated to maximizing revenue. Billing mistakes that go in your direction tend to get caught fast. The ones that go in theirs often do not.

“Up to 80% of medical bills may contain errors. Most people never check theirs.”

Start Here: Request Your Itemized Bill

The summary bill you get from a hospital tells you almost nothing. It shows one total. You cannot check a total.

What you need is an itemized bill — a line-by-line breakdown of every charge, every code, every supply, every procedure. You have a legal right to one.

Call the hospital billing department and say: 'I am requesting a complete itemized bill for my visit on [date], including all CPT and revenue codes.' If they push back, ask again in writing. They are required to provide it.

The 10 Most Common Medical Billing Errors

1. 1.Duplicate charges — the same service billed twice. Labs, imaging, and medications are the most common targets.
2. 2.Upcoding — billing a higher-complexity service than was actually provided. A quick office visit billed as a comprehensive exam.
3. 3.Unbundling — charging separately for services that should be billed together at one bundled rate, inflating your total.
4. 4.Services not rendered — charges for supplies or procedures you never received. Always check the medication list line by line.
5. 5.Wrong patient information — an error in your name, date of birth, or insurance ID that causes the claim to be misprocessed.
6. 6.Incorrect insurance information — your claim was submitted to the wrong insurer, or your coverage details were entered wrong.
7. 7.Balance billing violations — being charged the gap between the provider's full rate and what insurance paid, when that is prohibited by law.
8. 8.Preventive care billed as an office visit — your annual wellness exam must be billed as preventive care and covered at 100% under ACA. A diagnostic code changes that.
9. 9.Incorrect diagnosis codes — the wrong ICD-10 code can affect your coverage and your medical record in ways that follow you.
10. 10.Undisclosed facility fees — charges labeled 'facility fee' for seeing a doctor at a hospital-owned clinic, often never mentioned in advance.

How to Compare Your Bill to Your EOB

Your Explanation of Benefits from your insurer is the document to compare against your itemized bill. Your EOB shows what was billed, what your insurer paid, and what you owe.

Any charge on your itemized bill that does not appear on your EOB deserves a question. Any amount your provider bills you above your EOB 'member responsibility' is worth a dispute.

• Match every line on your itemized bill to an entry on your EOB
• Verify the dates of service match on both documents
• Verify the provider name matches on both documents
• Check that procedure codes on your bill match what the insurer processed
• Flag any charges on the bill that do not appear on the EOB at all
• Flag any amounts you owe that exceed your EOB member responsibility column

How to Dispute Billing Errors

1. 1

   Document the error in writing

   Write a formal dispute letter to the hospital billing department. Name each error by line item, CPT code, date of service, and what is specifically wrong. Attach your documentation — your EOB, your medical records, your discharge summary.

2. 2

   Send certified mail

   Send your dispute letter certified mail with return receipt. This creates a legal record. If the provider later tries to collect or send the debt to collections, your documented dispute matters.

3. 3

   Notify your insurer at the same time

   If an error involves a code that was submitted to your insurer incorrectly, tell your insurer and ask them to request a corrected claim from the provider. Both sides need to know.

4. 4

   Request a formal billing review

   Ask for a billing review or audit. Most hospitals have patient billing advocates or financial counselors. These are employees whose job is to help navigate exactly this. Use them.