HL7 Terminology (THO)
5.2.0 - Publication
This page is part of the HL7 Terminology (v5.2.0: Release) based on FHIR R4. This is the current published version in its permanent home (it will always be available at this URL). For a full list of available versions, see the Directory of published versions
This page describes how to use MDC with HL7 Standards.
The Medication Reference Terminology (MED-RT) replaced the National Drug File Reference Terminology (NDF-RT) as of UMLS v17AB. NDF-RT is no longer being maintained.
Source | Medication Reference Terminology - prepared by Veterans Health Administration, and distributed as part of UMLS by the NLM (direct link) |
System | http://va.gov/terminology/medrt |
Version | Use the date of the UMLS release as the version of MED-RT (if a version is desired). |
Code | The NUI is used for the code value for an MED-RT concept |
Display | The concept name should be used as the display. |
Inactive | There are no codes that are inactive. |
Subsumption | Subsumption testing is based on the Is-a relationship defined by MED-RT |
Filter Properties | None are described yet. |
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.
The representation of the contents of MED-RT in a FHIR CodeSystem resource may contain all concepts defined as existing solely in MED-RT, and relationships between concepts defined within MED-RT, and between MED-RT concepts and a concept in an external code system. In addition, ConceptMap resource(s) will be needed in order to represent the relationships in MED-RT that exist between external code systems.
Currently all references to external code systems in MED-RT are to a specific version of the external code system.
For more information, see the NCI MED-RT page.
MED-RT is released as part of UMLS. Therefore, each successive release has the date of the UMLS release as its version.
MED-RT has no copyright acknowledgement required. However, users must adhere to the UMLS license.
This section documents the property filters that can be used with the MED-RT code system in value set composition statements (ValueSet.compose).
Description | Select a set of concepts based on subsumption testing |
Property Name | concept |
Operations Allowed | is-a |
Values Allowed | NUI |
Comments | Includes all concepts that have a transitive is-a relationship with the concept Id provided in the value as an NUI (including the concept itself) |
No need for implicit value sets identified yet.