Accountable Care Organizations (ACOs) have potential to improve care for chronic conditions through incentives for better performance and bundled payments that promote care coordination. The Chronic Care Model (CCM) is a framework for providing health services for chronic conditions in primary care settings consistent with the organizational and financial goals of ACOs. Integrated mental health care – collaborative care by mental health and primary care providers for selected patients – improves care and is consistent with the Chronic Care Model. However, under the Medicare Shared Savings Program ACOs currently do not specify financial or organizational incentives for providing integrated mental health care through the CCM, leaving a missed opportunity to realize the full potential of ACOs to improve patient outcomes. We describe the rationale for incorporating mental health care into ACOs; how it can benefit consumers, providers, and ACOs; and what health care organizations can do to implement integrated mental health care.