New preliminary data from the Medicaid Budget and Expenditure System (MBES) released by the Centers for Medicare and Medicaid Services (CMS) details for the first time the number of adults enrolled in Medicaid under the new Affordable Care Act (ACA) Medicaid expansion category. The data show that as of March 2014, among 48 states reporting data, 4.8 million adults out of the total 54.1 million individuals enrolled in Medicaid were in the ACA Medicaid expansion category (referred to as the VIII Group based on the section of legislation that added the expansion eligibility category). Missing from this preliminary data report are DC, North Dakota and California, which due to its size accounts for a large share of Medicaid enrollees. The 4.8 million expansion adults includes 3.2 million adults that qualify for 100% federal match funding as individuals made newly eligible under the ACA and 1.5 million adults who fall into the adult expansion category but do not qualify for the full 100% federal match funding, but qualify for other enhanced match rates made available under the law. These data were released as part of state quarterly expenditure reports that are submitted to CMS through the MBES to claim federal matching funds, which began including enrollment data starting with the January through March 2014 quarter. These data provide another element of Medicaid enrollment that differs from other enrollment data released from CMS as part of its Medicaid and CHIP Performance Indicator Project, which provide point-in-time Medicaid and CHIP enrollment data to support program management and oversight. These two data sets are not comparable; they have different purposes and include different populations. This issue brief provides an overview of the new data as well as how it differs from the Performance Indicator data. Appendix Table 1 provides state by state enrollment data for March 2014.
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