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Research Data Center

National Ambulatory Medical Care Survey (NAMCS) and
National Hospital Ambulatory Medical Care Survey (NHAMCS)
Restricted Variables


The majority of NAMCS/NHAMCS variables are publicly available and researchers are highly encouraged to conduct preliminary analyses using these data. Researchers interested in accessing and/or conducting analyses using restricted NAMCS/NHAMCS variables must seek RDC approval. As part of the approval process, researchers are required to have a proposal approved by the RDC. Each proposal must include a data dictionary that describes the variables needed for analysis. Below is a list of the standard restricted variables. Please use this list when creating the data dictionary for your RDC Proposal.

NAMCS and NHAMCS Restricted Data [PDF - 37 KB]

If you are interested in using variables from NAMCS/NHAMCS that are not on the public files nor listed on the above file, please send an inquiry to In your email, include a list of questions from the survey instrument for which you were unable to find the corresponding variables. Proposals requesting these types of variables should not be submitted without first contacting






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