One thing that troubles me, is the hospital near me does the same thing, but "consoladates the bill". This literally is just a never ending fee that increases and they never list for what.
Every single month I call and they give me the run-around. After 6 months of this, I have yet to pay the full bill until they mail me an itemized list and without fail it's wrong. I contact them, they remove two or three charges, I ask them to mail me the updated one. They do, then next month I receive a bill for those proceedures they removed the last time.
Its to the point every month my bill now goes from $0 to ~$800, then back to $0 by the end of the month. Unfortunately, they now called and threaten the ~$800 "over due bill" to collection's. Luckily, I've recorded and documented everything, so I got it removed (again).
However, I'm just waiting for this to go to collection's at some point, even though I owe zero at the end of every month. I'm 90% sure this is a bug in their system, but I can't seem to get around it.
Having worked for a medical billing office, I hate to say it, but this is the norm. The billing office is often not officially the hospital or medical practice. Although we got all the records, we never really interacted and it was just files on a computer. I used to do write-offs, which was basically taking $10m a day and just clicking "don't need to pay". Usually it was dead people, poor, etc. At least that part of the job seemed somewhat nice.