Medicare ACOs saved the program $314 million in 2017, which the National Association of Accountable Care Organizations says shows ACOs' value -- but CMS says the fact that 2017 is the first time ACOs wielded net savings underscores a need to overhaul the Medicare Shared Savings Program. In 2017, 472 ACOs cared for 9 million beneficiaries in the MSSP, and they generated $1.1 billion in gross savings, -- but the number dropped to $314 million after accounting for shared savings...