The ACO Update: An Analysis of the Medicare Shared Saving Program's Proposed Rules The rules that management teams have been waiting for have finally been released – At the end of March, the federal Centers for Medicare and Medicare Services (CMS) released their proposed rules regarding the establishment of Accountable Care Organizations (ACOs) through the Medicare Shared Savings Program. Under the proposed rules, a service provider organization must join an ACO and apply to CMS in order to participate in the Shared Savings Program. Both for-profit and non-profit organizations are eligible to participate in the Shared Savings Program . . .