Following Medicare’s ACO Program Overhaul, Most ACOs Stay—But Physician-Led ACOs Leave At A Higher Rate

Health Affairs March 15, 2019
William K. Bleser, Robert S. Saunders, David Muhlestein, Andrew Olson, Robert Richards, Donald H. Taylor, Mark B. McClellan

Accountable care organizations (ACOs) have become a major payment and delivery reform since they were introduced as a key component of the Affordable Care Act. Currently, there are more than 1,000 ACOs covering about 33 million lives across all payers—numbers that have steadily increased over time. The ACO model continues to evolve, but it seems to be here to stay. In late 2018, the Centers for Medicare and Medicaid Services (CMS) released its Pathways to Success rule, overhauling its largest ACO program, the Medicare Shared Savings Program (MSSP). On February 12, 2019, CMS released the list of ACOs participating in the 2019 MSSP, allowing us to see who remained through the program’s sixth year (2018) and to conduct early analysis...

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