Doctors themselves often don't know what their services cost. The hospital does the billing, not them. And hospital bills are obscene, bizarre, and intentionally obfuscated. An aspiring costs $70 and a box of tissues becomes $150 "mucus collection therapy".
It's absurd, but it also performs a social function similar to the persecution of witches, heretics, and old eccentrics. (Yes, this sounds like it's coming out of left field. Please continue.) Namely, witch hunts were mostly economic in nature; you had middle- and upper-middle class (but not rich or important) older people, often women but some men, who'd amassed sizable savings that, being weakened by age and declining health and social isolation, they couldn't really defend. Witch hunts were a great way for corrupt clerics (Catholic, Protestant, both "sides" were in on it) and enterprising inquisitors to yank the savings of old and modestly wealthy people, in a way that had enough official muscle (religion) behind it that a large portion of their heirs wouldn't deign to go into the fight (for fear of being labelled heretics or witches themselves). Witch hunting was about many things, but raising money was a primary and overlooked motive.
Older people tend to have savings without the ability to defend it. When you have undefended money, there's a risk that someone will try to steal it. In the 16th century, witch hunting was the means. In the 21st-century U.S., it's medical bills: cooking up a way to suck savings off of people who are close to death and won't need them anymore. (The 25-year-old who gets denied cancer treatment is seen as just a casualty, but she's not the main target.) Medical bills are basically an inheritance tax built to fuck the middle class, yet the conservatives (who get up in arms if you apply an estate tax to double-digit millionaires) have absolutely nothing to say about it.