I do vaguely remember seeing some bills with such figures. I've been literally developing various OCR and medical coding crap to process the cases and I've seen plenty of real cases. Some cases had eye-popping bills attached, yes.

The $500K spike was some sort of a highway accident response, can't recall any additional details apart from some serious head/brain trauma.

Keep in mind that everything gets significantly inflated, x2 multiplier is guaranteed, x5 is likely, x10 is not uncommon. Again, from what I can remember.

Also keep in mind that billed != settled. If I recall correct, that bill was settled at something around $55K. That was many years ago.