This brief provides an overview of recent trends in Medicaid and CHIP enrollment as of January 2015, based on data from the Centers for Medicare and Medicaid Services (CMS) produced as part of its Performance Indicator Project. (All available months of data are available here: Total enrollment, Child enrollment.) The Performance Indicator Project provides new timely data on Medicaid and CHIP eligibility and enrollment that are intended to help strengthen data-driven program management and oversight efforts at both the national and state level. They also provide insight into Medicaid and CHIP eligibility and enrollment experiences as the ACA is implemented. (1) As of January 2015, 70.0 million people were enrolled in Medicaid or CHIP. Nearly two-thirds of enrollees resided in states that have implemented the ACA Medicaid expansion. (2) Between Summer 2013 and January 2015, there was a net increase of nearly 11.2 million people enrolled in Medicaid and CHIP among the 49 states reporting data for both periods. Most of this growth was in large states in the West that implemented the Medicaid expansion. (3) States that expanded Medicaid experienced significantly greater net Medicaid and CHIP enrollment growth between Summer 2013 and January 2015 than states that have not expanded. Nationally, total Medicaid and CHIP enrollment grew by 19% between Summer 2013 and January 2015. States that implemented the Medicaid expansion experienced over three times greater enrollment growth compared to states where the Medicaid expansion is not in effect (26% vs. 8%). (4) Children account for a greater share of total Medicaid and CHIP enrollment in nearly all states that have not expanded Medicaid compared to states that have expanded. Reflecting higher eligibility levels for children, children accounted for a greater share of total Medicaid and CHIP enrollees in non-expansion states compared to states that have implemented the expansion to adults. (71% vs. 43%).
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