Another thing is doctors with a bias to DO things, simply in order to bill for them. Often the things they do are worse for peoples’ health than the condition they are ostensibly fixing. The word for this is called Iatrogenic disease, and it’s a leading killer in the US.
Yep the incentive to use a 1000 dollar solution instead of a 100 dollar solution is pretty big when the government is paying for whichever one the doc wants to choose.