Much of the success of the Affordable Care Act (ACA) will hinge on issues surrounding access to care, particularly as millions of individuals become newly-insured and strain the capacity of provider systems. New service delivery reforms in state Medicaid programs and the private sector, as well as provisions in the ACA focused on increasing primary care reimbursement and provider supply, and increasing funding for Community Health Centers, hold promise to improve access to quality care. This brief describes the efforts taken by eight statesfive that have aggressively participated in ACA implementation and three states that have taken a limited approachin addressing provider capacity issues.