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UMLS API Technical Documentation


Current REST API Version: 0.63 beta

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Check out the Postman sample collections, or code samples in Python, Java, and Perl on Github to help you get started using the UMLS REST API.

Retrieving UMLS Concept Information

URIs | Query Parameters | Sample Output

URIs with /CUI support the following use cases:

  • Retrieve information (name, semantic types, number of atoms, etc) for a known CUI from latest UMLS version or a specific release.
  • Retrieve atoms for a known CUI.
  • Retrieve all definitions of a known CUI.
  • Retrieve relationships to other CUIs (broader/narrower).

Note that ‘current’ in the URI can always be used to search against the latest UMLS publication.
You may use any valid UMLS release back to 2008AA in your URI if you would like to search against a particular version of the UMLS.

URIs

The base URI is https://uts-ws.nlm.nih.gov/rest

Sample URI Description Returned JSON Object classType
/content/current/CUI/C0009044 Retrieves CUI Concept
/content/current/CUI/C0009044/atoms Retrieve atoms in a CUI Atom
/content/current/CUI/C0009044/definitions Retrieve CUI definitions Definition
/content/current/CUI/C0009044/relations Retrieve CUI relations ConceptRelation

Query Parameters

Parameter name Required? Y/N Description Valid Values Default value Usage Note
ticket Y A single-use service ticket is required for each call to the API. See authentication for more information n/a n/a n/a

Sample Output

The default for calls under /CUI/{CUI} is to return UMLS CUIs.

Sample output for https://uts-ws.nlm.nih.gov/rest/content/current/CUI/C0009044?ticket=ST…

{
    "pageSize": 25,
    "pageNumber": 1,
    "pageCount": 1,
    "result": {
        "classType": "Concept",
        "ui": "C0009044",
        "suppressible": false,
        "dateAdded": "09-30-1990",
        "majorRevisionDate": "08-18-2015",
        "status": "R",
        "semanticTypes": [
            {
                "name": "Injury or Poisoning",
                "uri": "https://uts-ws.nlm.nih.gov/rest/semantic-network/2015AB/TUI/T037"
            }
        ],
        "atomCount": 63,
        "attributeCount": 0,
        "cvMemberCount": 0,
        "atoms": "https://uts-ws.nlm.nih.gov/rest/content/2015AB/CUI/C0009044/atoms",
        "definitions": "NONE",
        "relations": "https://uts-ws.nlm.nih.gov/rest/content/2015AB/CUI/C0009044/relations",
        "defaultPreferredAtom": "https://uts-ws.nlm.nih.gov/rest/content/2015AB/CUI/C0009044/atoms/preferred",
        "relationCount": 5,
        "name": "Closed fracture carpal bone"
    }
}