The Most Common Medical Billing Errors (and How to Catch Them)

A medical bill arrives having passed through almost no one whose job is to check it on your behalf. It's generated by codes, sent out, and assumed correct until someone pushes back. That someone is you, and errors are common enough that pushing back is worth your time more often than not. Here are the ones that show up the most.

The usual suspects

• Duplicate charges. The same service billed twice — sometimes on one bill, sometimes split across two bills for the same visit. Easy to miss, easy to catch once you're looking.
• Quantity errors. A unit count entered wrong: billed for thirty when you got three. A single keystroke that multiplies the charge.
• Upcoding. A service billed at a higher level than what you received — a routine visit coded as a complex one. The description won't show it; the code will.
• Unbundling. Charges that should be billed together as one package, split into separate pieces to raise the total.
• Services you never received. A test, a consult, a procedure on the bill that simply didn't happen to you.
• Wrong dates. Charges dated to days you weren't there, or after you went home.
• Charges for canceled care. A procedure that was scheduled, then called off, but billed anyway.
• Balance bills you don't owe. An in-network provider charging the write-off, or a surprise out-of-network charge in a protected situation.

How to catch them

The method is the same for all of them, and it's not technical. Get the itemized bill, put it next to your EOB, and read it against your own memory of the care. Errors reveal themselves at the intersection of three things: what the bill claims, what your insurer's EOB says, and what you actually remember happening. Anything that's true on the bill but doesn't square with the EOB or your memory is a line to question.

You don't need to find all of these on every bill — most bills won't have most of them. You need to know they exist, so that when one is there, you see it instead of paying past it.

This isn't medical or legal advice — it's the errors worth watching for and the one method that catches them.