Description

Searches for an identifier (id parameter) from an RxNorm vocabulary indicated by idtype. Returns the RxCUIs of concepts associated with that identifier.

The scope of the search is either Active concepts (allsrc=0) or Current concepts (allsrc=1).

Sample ID types and IDs are shown in the following table.

Scope

Selectable (see parameters):

• Active: concepts in the current RxNorm data set that have an atom with SAB=RXNORM and SUPPRESS=N

• Current: concepts in the current RxNorm data set that have an atom with SUPPRESS=N

Parameters

All query parameters are case-insensitive.

Note that HTTP requires that query parameters be "URL encoded". For full information on URL encoding, please refer to IETF RFC 3986, "Uniform Resource Identifier".

Output structure

Results are available as either XML or JSON.

• The XML result has the root element rxnormdata. It is described in the XML Schema for the RxNorm API; the relevant element structure is summarized below. Elements that would be empty might be left out.

• The JSON result is an object {...}, analogous to the content of the XML rxnormdata. Fields that might occur multiple times in the XML are expressed as an array. Fields that would be empty might be null or left out. Numbers are expressed as strings.

Both XML and JSON results follow the same outline:

rxnormdata

Root element in XML, or anonymous object in JSON

idGroup

rxnormId (array)

A concept associated with the requested ID

Example: 2-segment NDC finds multiple concepts

XML: https://rxnav.nlm.nih.gov/REST/rxcui?idtype=NDC&id=0009-7529

JSON: https://rxnav.nlm.nih.gov/REST/rxcui.json?idtype=NDC&id=0009-7529

An XML result is shown below.

<rxnormdata>
    <idGroup>
        <rxnormId>1726321</rxnormId>
        <rxnormId>1726325</rxnormId>
        <rxnormId>1726335</rxnormId>
    </idGroup>
</rxnormdata>