I agree with bluestream, what difference does it make? I cam maybe see it if the person is prone to heart attacks or something like this, that there is a "pre existing" condition. However, does anybody really want their knee operated on just for the fun of it? This needs to be thought out logically.
If someone was uninsured and hurt their knee, then signed up for insurance to cover it, this is like buying car insurance after you crash your car into something, and then claim the crash happened a few days later than it did... that is wrong.
But if someone has nursed their knee injury for some time, and age, time, other circumstances has caused it to get to the point where operations are necessary, I dont see it as logical that this is the same sort of preexisting condition... Nobody wants to go get surgery, IMO.
From what I have seen, these insurance companies bill/pay incorrectly, and they try to get away with whatever they can. I had the payment for a doctor's visit go to collections once, because the insurance billed/paid it wrong. Once I talked to them for the twentieth time and got them to straighten it out, it was paid no problem.
Why does the insurance company know about her lacross playing habits anyway?
All that said, and whether they have student loans or not, the amounts that these doctors charge for the knowledge they hold is scary. Most doctors do not truly understand the underlying chemical, mechanical and electrical basis for why things occur in the body. A surgery is a bit different, as they are in theory, repairing something better than it was, but most of these treatments just mask underlying issues of which they do not understand...