The Medicare Shared Savings Program, created under the Affordable Care Act, aims to reward participating ACOs that succeed in lowering health care costs while improving performance. Depending on how the organizations perform on several quality measures, they will "share savings" in Medicare Part A and B payments. However, a new study in Health Affairs analyzing the effects of the program quality measures and performance targets on Medicare costs reports that a simulated population of patients ages 65-75 with type 2 diabetes produced a 10-percentage-point improvement in performance on diabetes quality measures, which would reduce Medicare costs by up to only about 1 percent. To view the study, please visit the Health Affairs website (subscription required):