Congress controls the nation's purse strings. It can tell the Executive Branch how to spend money. It can regulate all commerce, and by the way, to Congress, everything is "commerce."
Congressional legislation can incent economic behavior--pay for this, but not for that--but it can't change personal decisions. A case in point is Robert Colton, ACP Member, of Boca Raton, Fla., who says he authorizes the tests that his patients demand. His opinion about that is the headline of this piece. He says there's little incentive not to order tests and little in health care reform to make him and others change their habits. More likely is the idea that, once new medical technology is invented, it will find a use.
Another article compiles a wide spectrum of ideas on how to reduce health care spending. Tort reform was one, sure, but many doctors focused on changing patient behavior first. Feel free to offer your ideas in the comments below.