Yes a spreadsheet sum of potentially incorrect items, which the only way you’d know about is if you see the items, not the summary. Hence OPs post.

Not saying that it’s impossible… But, the way most of these codes are input is when a provider scans in a medication or procedure before they administer it.

Electronic medical records systems like Epic basically streamline physician notes with medical billing. It’s actually a lot easier nowadays to accidentally forget to input a billing code than it is to add extra billing information.

Tbh if you get a large and unexpected bill from the hospital, a more effective route is to ask if they have a hardship, charity care, or financial assistance program.

Hospitals, especially state funded ones like the one I practice at are so used to people not being able to pay their bills that we regularly have to write off a ton of medical care. They are usually more than happy to drastically discount care for people who are willing to pay for even part of their bill.