From Modern Healthcare — 

The CMS recently finalized a rule that overhauls the Medicare Shared Savings Program, requiring accountable care organizations to take on risk sooner or be booted out of the program. 

Under the redesigned program, which will take effect July 1, 2019, ACOs can choose to participate in one of two tracks: basic or enhanced. The basic track, which has a five-year performance period, only allows ACOs entering the program to be in a one-sided risk contract for two or three years depending on their revenue.