Accountable care organizations (ACOs) and plans have expressed concern about model overlap after the Center for Medicare and Medicaid Innovation (CMMI) announced two new voluntary primary care models on Monday, prompting the National Association of Accountable Care Organizations (NAACOS) to say it will push CMS to put into writing which models ACOs can participate in even as CMS clarified for Inside Health Policy how model participation will work. The new models are meant to encourage primary care providers to take...