[cvccvroomvroom]

You have to demand a coded bill ahead to time or you must refuse treatment. If it's not in writing, then there's no evidence. If they refuse, then you have to be willing to walk away.

Also, pay by check including the phrase "payment in full".

[tonightstoast]

Agreed. I will be trying to get a coded bill beforehand but most places will tell you "everything we do is an estimate". Which is so bullshit, but brings me back to my original point: they know they can fuck you, and they enjoy doing it.