Restricted-Use NCHS-CMS Medicaid Data
NCHS survey data have been linked to the research-oriented Medicaid files known as the Medicaid Analytic eXtract (MAX) files. The MAX files include data for enrollees in Medicaid and in the Children’s Health Insurance Program (CHIP) in all 50 states and the District of Columbia.
The MAX data system consists of a person summary (PS) file and four claims files: inpatient (IP), institutional long-term care (LT), prescription drugs (RX) and other services (OT).
Detailed descriptions of each of these files can be found in the following NCHS report:
Data Access
Due to confidentiality requirements, the Restricted-use NCHS-CMS Medicaid Data are accessible only through the NCHS Research Data Center (RDC). All interested researchers must submit a research proposal to the RDC. Please see the RDC web site for instructions on submitting a proposal (RDC website).
NCHS has created Feasibility Study Data files to assist researchers who are considering submitting an RDC application to analyze the linked NCHS-CMS Medicaid data. Please consult the Public-Use NCHS-CMS Medicaid Feasibility Files page for more information.
Data Dictionaries and Variable Crosswalk
Restricted Use Data Dictionaries:
- NCHS created variables [PDF – 69 KB]
- Person Summary (PS) File [PDF – 407 KB]
- Inpatient (IP) File [PDF – 272 KB]
- Long-term Care (LT) File [PDF – 253 KB]
- Prescription Drug (RX) File [PDF – 270 KB]
- Other Services (OT) File [PDF – 257 KB]
Variable Crosswalk:
- Page last reviewed: March 29, 2016
- Page last updated: March 29, 2016
- Content source: