Much of the slowdown is because of the recession, and thus not unexpected, health experts say. But some of it seems to be attributable to changing behavior by consumers and providers of health care — meaning that the lower rates of growth might persist even as the economy picks up…

“The tectonic plates might be beginning to shift,” said Karen Davis, the president of the Commonwealth Fund, a nonprofit research group in New York. “It’s hard to believe everything that’s been tried over the last decade to slow spending wouldn’t be making a difference.”

Experts were surprised, for instance, at a drop in spending on some hospitalized seniors — people enrolled in Medicare, whose coverage the recession should not affect. They also noted that some of the states where health care spending slowed most rapidly were states that were not hit particularly badly by the recession, suggesting that other factors were at play…

The implications of a bend in the cost curve would be enormous. Policy makers on both sides of the aisle see rising health care costs as the central threat to household budgets and the country’s fiscal health. If the growth in Medicare were to come down to a rate of only 1 percentage point a year faster than the economy’s growth, the projected long-term deficit would fall by more than one-third.