On January 1, 2014, many key provisions of the Affordable Care Act (ACA) will start to go into effect, including the expansion of Medicaid to low-income adults and the launch of new Medicaid eligibility and enrollment processes, which are designed to move toward a coordinated enrollment system across health coverage programs, including Medicaid, CHIP, and the new Health Insurance Marketplaces. Over the past year, states have made steady and significant progress preparing for these changes, but readiness varies considerably as 2014 nears, and implementation work and ongoing process improvements will continue into the foreseeable future. To provide greater insight into the status of implementation, this report provides an overview of key state Medicaid eligibility and enrollment policies slated to go into effect based on data released by the Centers for Medicare and Medicaid Services (CMS).