Report for Phase IV 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.

Download a PDF of the Phase IV SNACC report.

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). The results of the Phase III analysis were compared to the results from the Phase II analysis to determine if the expected higher match rate (given the additional information for finding matches in Phase III) affects the substantive conclusions of the analysis. Frame coverage was also analyzed to determine if frame differences (i.e., incomplete identification of individuals) affect the substantive conclusions of the analysis.  July 2008.

Download a PDF of the Phase III SNACC report.

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

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. March 2008.

Download a PDF of the Phase II SNACC report.

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

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. The quality of the database of health-insurance enrollment was evaluated by assessing the ability to accurately merge the input files and by comparing the characteristics of the individuals in the database to expectations based on Medicaid eligibility rules and characteristics of the U.S. population.  February 2007.

Download a PDF of the Phase I SNACC report.

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

Presentation by Lynn Blewett to the Minnesota Senate Health and Human Services Budget Division in St. Paul, MN, August 18 2009.

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