Silver Book Fact
Health care spending exceeded 15% U.S. GDP in 2004 ($1.9 trillion) and is expected to increase to as much as 20% by 2015.
Redberg R. Evidence, Appropriateness, and Technology Assessment in Cardiology: A case study of computed tomography. Health Aff. 2007; 26(1): 86-95. https://www.healthaffairs.org/doi/10.1377/hlthaff.26.1.86