The Centers for Medicare & Medicaid Services (CMS) March 10 announced its Next Generation Accountable Care Organization (ACO) Model, which will be added to its existing portfolio of ACO models. The agency said the new model is intended for ACOs that are experienced in coordinating care for populations of patients, and will allow them to assume higher levels of financial risk and reward than under the Pioneer Model and Shared Savings Program. It expects 15-20 ACOs to participate in the new model, which will include three initial performance years and two optional one-year extensions. Round one letters of intent to participate are due May 1 and applications are due June 1.