NCHS Data Linkage

NCHS Data Linked to CMS Medicaid Enrollment and Claims Files

NCHS has linked various surveys with Medicaid enrollment and claims records collected from the Centers for Medicare & Medicaid Services (CMS) Transformed Medicaid Statistical Information System (T-MSIS). Linkage of the NCHS survey participants with the CMS T-MSIS data creates a new data resource that can support research studies focused on a wide range of patient health outcomes and the association of means-tested government insurance programs on health and health outcomes.

Medicaid enrollment and claims data for 2014 through 2019 are available for all successfully matched NCHS survey participants. For certain NCHS surveys, the Medicaid administrative files include data from before and/or after the survey year of interview.

1999-2014 linked NCHS-CMS Medicaid Analytic Extract (MAX) data are available from a previous linkage for some NCHS surveys. Data users should be aware that, although this previous linkage is still available for use in approved research proposals, the 1999–2014 linked Medicaid data is in the Medicaid Statistical Information System (MSIS) MAX format, which differs substantially from the current 2014-2019 T-MSIS data format. For more details, see the page for previous MAX linkage.

NCHS Surveys Linked to CMS T-MSIS Data

  • 1994-2018 National Health Interview Survey (NHIS)
  • 1999-2018 National Health and Nutrition Examination Survey (NHANES)
  • Third National Health and Nutrition Examination Survey (NHANES III)
  • 2004 National Nursing Home Survey (NNHS)

Linked NCHS-CMS Medicaid Data Bibliography


The details of the linked data, linkage methods, and analysis considerations, are available from the links on the navigation menu. For additional questions, contact the Data Linkage Team:

Data Linkage Team
Division of Analysis and Epidemiology
National Center for Health Statistics
Centers for Disease Control and Prevention
3311 Toledo Road
Hyattsville, MD 20782