https://en.wikipedia.org/wiki/Healthcare_Common_Procedure_Co...
Edit: also note that CPT codes are part of the HCPCS
It'd be nice if patients didn't have to worry about these sorts of issues when receiving emergent care, but such is the country we live in.
The article touched on this, and I also discovered this through my own research when I attempted to dispute what in fact a Level 5 was. Add to the fact, that by entering into the hospital you are asked to enter into an arbitration agreement.
Compound this with the monopoly nature of an ER, and the only thing keep prices from spiraling out of control is the sheer benevolence of the hospital employees.
Additionally, insurance companies would be understandably upset if a hospital was charging them more than they should have been, so potential investigations that shed more light on this could help stabilize this part of the market. I appreciate your insight!
To use another example: You have a lump on your breast. It's either cancer or a benign cyst. Would you bill these differently for the diagnosis work on the doctor's part? Maybe I'm misunderstanding what happened in your situation, but if the same exact steps are taken in diagnosing appencitis vs gas, wouldn't you bill the same?
Edit: Oh I forgot to mention the main reason I commented. I have also heard that billing less (like level 4) even if you completed all the steps for level 5 but do not want to get flagged by the system for overbilling can in turn actually get you flagged for underbilling, and can be cause for an investigation/audit.