Track Switching in Medicare ACO Programs: A Look at the Move to Downside Risk

Despite most accountable care organizations (ACOs) in the Medicare Shared Savings Program (MSSP) remaining in upside-only models, some ACOs have made the switch into risk-bearing tracks and/or participated in risk-bearing Center for Medicare and Medicaid Innovation (CMMI) demonstration models such as Pioneer and Next Generation. In this report, we provide an analysis of the differences between these track switchers and other Medicare ACOs.