Despite a recent report from the Centers for Medicare & Medicaid Services that showed Medicare ACOs improved in both quality and savings their second year, three additional ACOs left the Pioneer program this month, leaving just over half of the original 32 participants. The mixed CMS results indicate that while ACOs have great potential to help reform the healthcare model, it also demonstrates that it will be an arduous, gradual process, Stuart Guterman, vice president for Medicare and cost control at the Commonwealth Fund, told MedPageToday. Read the full story from FierceHealthcare