HCR Update from Mark Sanna: Accountable Care Organizations are saving money. Provider groups involved in Medicare ACO programs saved a total of $380 million in the first year. Of the 114 Shared Savings Program ACOs in the first year, 54 had lower spending than projected. But just 29 generated enough savings to qualify to keep some of it, which totaled $126 million for the provider networks and an additional $128 million for the Medicare Trust Fund.