RxCUI History API
THIS API WAS DEPRECATED IN JULY 2020 and removed in January 2021. See /historystatus and /allconceptsbystatus resources in the RxNorm API for replacement resources.

The RxCUI History API is a RESTful web service for RxNorm concept history. It allows users to obtain concept information on any RxNorm concept which has ever been in a version of the RxNorm data set (starting in 2005). This is especially useful for looking up information on retired concepts or concepts that do not contain RxNorm vocabulary terms. No license is needed to use the RxCUI History API.


The API can be accessed by clients in the following way:
Note: Please check the Terms of Service for restrictions on using the APIs.

Functions and Resources

In the table, the base URI ( https://rxnav.nlm.nih.gov/REST/rxcuihistory ) for the REST resources has been omitted to improve readability.

REST Resource Description
/concept Deprecated July 2020. Get the history information for an RxNorm concept (specified by RxCUI)
/status Deprecated July 2020. Get the concepts of a specified status