Health spending is forecasted to increase until 2019, resulting from the economic recession, baby boomers aging into Medicare and changing demographics. This Health Affairs article discusses health care service costs growth as a portion of GDP and public spending.

Truffer, C.J., et. al. (2010). Health spending projections through 2019: the recession's impact continues. Health Affairs, 29(3): 522-529. doi: 10.1377/hlthaff.2009.1074. http://content.healthaffairs.org/cgi/content/abstract/hlthaff.2009.1074 

Authors: Christopher J. Truffer, Sean Keehan, Sheila Smith, Jonathan Cylus, Andrea Sisko, John A. Poisal, Joseph Lizonitz and M. Kent Clemens