CMS innovation center chief Adam Boehler told accountable care organizations on Thursday (Oct. 4) the agency should offer models with simplicity, predictability and transparency, but participating providers need to be held accountable for their care -- and, if not, others are waiting to take their place in the system. However, ACO CEOs said it would be difficult for others to take the place of ACOs if those organizations dropped out of value-based care models. Boehler said at a National Association...