Health Insurance Marketplace: March Enrollment Report. For the period: October 1, 2013 - March 1, 2014. Methodological Overview


The data reported here have been generated by the information systems of the Centers for Medicare & Medicaid Services (CMS), based on information reported to CMS by SBMs, and information collected by the FFM for states with HHS-supported or fully run Marketplaces (including those run in partnership with states). Data for certain metrics are not yet available for some SBM states due to information system issues. (Please refer to Appendix D for additional methodological information.)

As discussed earlier, this report includes cumulative data for the five-month period (10-1-13 to 3-1-14) because some people apply, shop, and select a plan across more than one monthly reporting period. To the extent possible, these counts seek to avoid potential duplication associated with monthly reporting.

This report also includes preliminary data on the characteristics of persons who have selected a Marketplace plan (by gender, age, metal level, and financial assistance status for the SBMs and FFM; and for the FFM, by gender and age, gender and metal level, financial assistance status and metal level, and metal level and age). In some cases, the data for certain characteristics of Marketplace plan selections are not yet available. Detailed state-level tables can be found in Appendix C, and in the Addendum to the March Marketplace Enrollment Report.19

We believe that the information contained in this issue brief provides the most systematic “snapshot” of enrollment-related activity in the Marketplaces to date because the data for the various metrics are counted using comparable definitions for data elements across states, and between the SBMs and FFM. It is important to note that the SBM enrollment-related data that are reported in this issue brief represent state data that have been reported to CMS through March 7, 2014, and may differ from comparable data that have previously been publicly reported on SBM websites or in media reports because that data may be based on different time periods or metric definitions from those used in this report.

19 The Addendum to the March Enrollment Report is available at .

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