It's not greed, it's a consequence of health insurance. Get rid of health insurance and prices would drop 10x.
I am not sure, so I really would love to see the numbers/facts supporting your statement. Would love to learn of this magic fact. [cynicism end]
[Edit]: Typo
[Edit 2:] In Germany, with full health-insurance the cost for a Cardiopulmonary bypass are round about 30k €. So a lot cheaper, than in the US, despite health insurance.
Just wanted to present a fact, not let my comment stand as cynicism only.