What medical billing errors show up most often?

The repeats we see on itemized statements are dull and expensive: the same lab twice, a supply kit billed and then billed again as pieces, operating room time rounded up, and pharmacy lines with a markup that would embarrass a drugstore.

None of that means the care was bad. It means the bill was assembled by a system that rarely gets proofread. A free scan is a reasonable way to see which of those patterns are on your pages.