Time's very lucid cover story asks why medical bills are so high:

Yet those who work in the health care industry and those who argue over health care policy seem inured to the shock. When we debate health care policy, we seem to jump right to the issue of who should pay the bills, blowing past what should be the first question: Why exactly are the bills so high?

Time has no answers but asked a lot of the right questions.

Why are the bills so high, and why is there nothing we can do to control the costs?

"we spend more on health care than the next 10 biggest spenders combined: Japan, Germany, France, China, the U.K., Italy, Canada, Brazil, Spain and Australia. We may be shocked at the $60 billion price tag for cleaning up after Hurricane Sandy. We spent almost that much last week on health care. We spend more every year on artificial knees and hips than what Hollywood collects at the box office. We spend two or three times that much on durable medical devices like canes and wheelchairs, in part because a heavily lobbied Congress forces Medicare to pay 25% to 75% more for this equipment than it would cost at Walmart."

You answered my question with more evidence that makes me wonder why there is nothing we can do to control the costs.