"The big story in the Medicare world these days is the slowdown in program spending. Based on our comparison of CBO’s August 2010 and August 2014 baselines, Medicare spending this year will be about $1,200 lower1 per person than was expected in 2010, soon after passage of the Affordable Care Act (ACA), which included reductions in Medicare payments to plans and providers and introduced delivery system reforms that aimed to improve efficiency and reduce costs. By 2019, Medicare spending per person is projected to be more than $2,400 lower per person than was expected following passage of the ACA. Medicare spending projections in CBO’s August 2010 and subsequent baselines take into account the anticipated effects of the ACA, along with other factors that are expected to affect future Medicare spending. So it seems that the ACA may be having a bigger than expected effect, but something else may be going on here too."