Accountable Care Organizations (ACOs) are a tool promoted by the Centers for Medicare and Medicaid Services to help achieve the "Triple Aim" of better care, better health, and lower costs. ACOs integrate high-performing healthcare providers into coordinated systems using financial incentives to encourage population health management. While the goals of ACOs are to improve quality and lower costs, setting them up requires significant investments in care coordination infrastructure and overcoming cultural barriers. Physicians will be central to developing successful ACO models. Overall, ACOs are one part of various bundled payment and value-based initiatives aimed at shifting to alternative payment models.