Medicare Shared Savings Program
Number of participants: 220, with more set to join Jan. 1, 2014.
Explore this issue:April 2013
Run by: Centers for Medicare and Medicaid Services (CMS).
How it works: Participants include many smaller and less experienced organizations that may need more time and resources to integrate their health care delivery. ACOs can choose between a one-sided, shared savings model with no downside risk and a two-sided model that offers more reward in exchange for assuming some financial risk.