2019 MSSP ACO results announced Washington Connection - September 22, 2020 Medicare Payment Policies Sign in to save Sept. 17, 2020: The 541 accountable care organizations (ACOs) participating in the Medicare Shared Savings Program (MSSP) generated nearly $1.2 billion in net savings in 2019, the highest number to date for the program. ACOs saved $739 million in 2018 and $313 million in 2017. CMS Administrator Seema Verma announced the results in a blog post on Health Affairs, which includes links to more comprehensive data files. MSSP ACOs share in any savings generated for Medicare if they meet certain spending and quality metrics. The MSSP is the largest Medicare APM and began in 2012.