Restricted-Use Linked NHCS-NDI Data
Through its data linkage program, NCHS has been able to expand the analytic utility of the data collected from National Hospital Care Survey (NHCS) by augmenting it with mortality data from the National Death Index (NDI). Linkage of NHCS data with the NDI mortality data provides the opportunity to conduct a vast array of outcome studies designed to investigate the association of a wide variety of health factors with mortality.
Descriptions of the methods used for linkage and analytic considerations for the NHCS linkages to the NDI can be found in the following online reports:
Due to confidentiality requirements, the Restricted-use linked NHCS-NDI data are accessible only through the NCHS Research Data Center (RDC) Network. All interested researchers must submit a research proposal to the RDC. Please see the RDC website for instructions on submitting a proposal.
- Mortality Variables pdf icon[PDF – 244 KB]
- Death Certificate and NDI Match Variables pdf icon[PDF – 207 KB]
Cause of Death Codes