By 2017, consumers and taxpayers will spend more than $4 trillion on health care, accounting for one of every $5 spent, the federal government projects.

The 6.7 percent annual increase in spending — nearly three times the rate of inflation — will be largely driven by higher prices and an increased demand for care, the Centers for Medicare and Medicaid Services said Monday. But other factors in the mix include a growing and aging population. The first wave of baby boomers become eligible for Medicare beginning in 2011.

With the aging population, the federal government will be picking up the tab for a growing share of the nation’s medical expenses. Overall, federal and state governments accounted for about 46 percent of health expenditures in 2006. That percentage will increase to 49 percent over the next decade.

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