Review of Existing Data Sources to Assess the Impacts of the Affordable Care Act Medicaid Expansions: Working Paper. Notes


  1. Other non-financial eligibility criteria, such as citizenship and immigration status, must also be met. The law expands Medicaid eligibility to 133% of poverty, with a standard 5% income disregard, which makes the effective eligibility level 138% of poverty.

  2. For example, Medicaid payment rates for primary care services by primary care providers will be increased to the Medicare payment level in 2013 and 2014, with the full cost of the difference paid by the Federal Government.

  3. Sonier, J., and E. Lukanen. 2011. A Framework for Tracking the Impacts of the Affordable Care Act in California. Minneapolis, MN: State Health Access Data Assistance Center.

  4. The data scan also included sources of information on state policy choices. These data sources are reviewed separately in a later section of this report.

  5. The chronically homeless population was also included on the original list of specific populations of interest for this project; however, we were unable to identify any existing data sources suitable for evaluating the impacts of the Medicaid expansion on this population. Conducting new data collection is beyond the scope of this project.

  6. In addition, there is a substantial amount of missing data for the continuous poverty variable in the NHANES public use file.

  7. As noted in the table, the NSDUH sample sizes actually use an income cutoff of 100% of poverty because the public use file does not allow for more detailed income categories. Thus, actual sample sizes for the population groups of interest are likely somewhat larger in the full file.

  8. Davern, M., G. Davidson, J. Ziegenfuss, et al. 2007. A Comparison of the Health Insurance Coverage Estimates from Four National Surveys and Six State Surveys: A Discussion of Measurement Issues and Policy Implications. Final report for HHS/ASPE, Task 7.2.Minneapolis, MN: University of Minnesota. Available at:

  9. Personal communication with Jason Fields, Census Bureau, March 2012.

  10. This discussion includes only the BRFSS core survey and optional modules. It should be noted, however, that some states ask add-on questions that collect more detail about health insurance type.

  11. Detailed information about the years of data collection for specific measures is available at

  12. Heberlein, M., T. Brooks, J. Guyer, S. Artiga, and J. Stephens. 2011. Holding Steady, Looking Ahead: Annual Findings of a 50-State Survey of Eligibility Rules, Enrollment and Renewal Procedures, and Cost Sharing Practices in Medicaid and CHIP, 2010–2011. Washington, DC: Kaiser Commission on Medicaid and the Uninsured.

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