Two reports were produced for the Second Phase of the HIFA Evaluation Study, Medicare/Medicaid Research and Demonstration Task Order Contract (MRAD/TOC) HHSM-500-2005-00027I, T.O. 2

These reports are not available for download at this time, but are available upon request to Dr. Kathleen Call, callx001@umn.edu or 612-624-4802.

The reports are described below:

Report for Phase 1 of the Medicaid Undercount Project (SNACC).  This phase involved re-using the Phase II process, replacing the CPS data with NHIS data. In addition to providing explanations for discrepancies between the national NHIS and MSIS, comparisons to Phase II results allowed the examination of how survey design and implementation affect the quality of the resulting survey data and the estimates derived from it.  May 2009.

For more information see SHADAC's web page for the Medicaid Undercount Project.

Report for Phase III of the Medicaid Undercount Project (SNACC).  In this phase data from the state MSIS files, CPS, 2001 Supplemental Survey (SS01), as well as the MAX and Census Bureau Master Address File (MAF) were used. The Census Bureau worked with CMS to negotiate the acquisition of state MSIS files that enhance the capability of finding matches because they included person names and addresses (in contrast with the national file, which does not include this identifying information).

Report for Phase II of the Medicaid Undercount Project (SNACC). In this phase data were merged from the Medicaid Analytic Extract (MAX), MSIS, the Current Population Survey (CPS), the Person Characteristic File (PCF), and the Master Address File Auxiliary Reference File (MAFARF). Once matches/non-matches between the MSIS and CPS were determined, the matched records were supplemented with information from the MAX and examine why there were discrepancies between MSIS records of enrollment and CPS reports of Medicaid coverage. The MAFARF and PCF are used to augment the analysis.

Report for Phase I of the Medicaid Undercount Project (SNACC).  This phase involved creating a national database of health-insurance enrollment and evaluate the quality of the information it contains. This was done by merging the CMS Medicaid Statistical Information System (MSIS) files with the CMS Medicare (EDB) files.

Presentation by Michael Davern at AAPOR in Hollywood, FL, May 15 2009.

The largest portion of the Medicaid undercount is caused by survey reporting error; that is, Medicaid recipients misreport their enrollment in health insurance coverage surveys. In this study, we sampled known Medicaid enrollees to learn how they respond to health insurance questions and to document correlates of accurate and inaccurate reports. We found that Medicaid enrollees are fairly accurate reporters of insurance status and type of coverage, but some do report being uninsured. Multivariate analyses point to the prominent role of program-related factors in the accuracy of reports.

Presentation by Kathleen Thiede Call at the 2009 SHADAC State Survey Workshop in Washington, DC, January 13 2009.

Presentation by Michael Davern at the 2009 SHADAC State Survey Workshop in Washington, DC, January 13 2009.

This brief by Bonnie J. Austin, published by the Changes in Health Care Financing & Organization (HCFO) program of the Robert Wood Johnson Foundation, summarizes SHADAC's study of the Medicaid undercount in Minnesota, California, Florida, and Pennsylvania. The brief outlines key findings and discusses implications for policy and practice. September 2008.