HL7 Terminology (THO)
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HL7 Terminology (THO), published by HL7 International - Vocabulary Work Group. This guide is not an authorized publication; it is the continuous build for version 7.0.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/UTG/ and changes regularly. See the Directory of published versions

Medication Reference Terminology (MED-RT) Metadata Record

Metadata Record Information Version 20251031
Maintained By HL7 Terminology Services Management Group (TSMG)
Last Updated Date 31 October 2025
Responsible Organizations U.S. Department of Veterans Affairs (VA) Roles
  • Code System Owner
  • Code System Maintainer (Steward)
  • Code System Publisher
Website https://www.va.gov/
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Code System Names Formal name Medication Reference Terminology (MED-RT)
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Code System Technical Identifiers Identification Record
TSMG-endorsed URI http://va.gov/terminology/medrt
TSMG-endorsed OID 2.16.840.1.113883.6.345
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Description
Medication Reference Terminology (MED-RT) is the evolutionary successor to the Veterans Health Administration National Drug File – Reference Terminology (VHA NDF-RT). Both are formal ontology representations of medication terminology, pharmacologic classifications, and asserted authoritative relationships between them. The MED-RT code system includes relationships between MED-RT concepts and concepts in external code systems, as well as relationships between concepts only in the external code systems. The external code systems that MED-RT references include RxNorm, MeSH, and SNOMED CT US Edition. MED-RT can be downloaded from https://evs.nci.nih.gov/ftp1/MED-RT/ For more information, please see https://ncit.nci.nih.gov/ncitbrowser/pages/vocabulary.jsf?dictionary=MED-RT
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Code System Copyright, Intellectual Property and Licensing Copyright Statement
MED-RT has no copyright acknowledgement required. However, users must adhere to the UMLS license.
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