On April 2, 2013, CMS published a final rule establishing increased Federal Medical Assistance Percentage (FMAP) rates for certain adult populations under states’ Medicaid programs effective January 1, 2014, as authorized by the Affordable Care Act (ACA). The rule sets forth the method states will use to claim the matching rate that is available for Medicaid expenditures of individuals with incomes up to 133% of the federal poverty level and who are defined as “newly eligible” and are enrolled in the new eligibility group. Under the rule, the federal government will pay 100% percent of the cost of this newly eligible adult population through 2016, and this rate will be phased down to a permanent 90% matching rate by 2020. The rule also describes a temporary general increase in FMAP rates for certain expansion states that meet required statutory criteria. The rule is effective June 3, 2013. Comments will be accepted until June 3, 2013 on a limited number of provisions of the rule, including the threshold methodology states will be required to use to document claims for the increased FMAP rate.