HL7 Terminology (THO)
6.0.2 - Publication International flag

This page is part of the HL7 Terminology (v6.0.2: Release) based on FHIR (HL7® FHIR® Standard) v5.0.0. This is the current published version. For a full list of available versions, see the Directory of published versions

Using NDF-RT with HL7 Standards

This page describes how to use LOINC with HL7 Standards.

IMPORTANT NOTE:As of UMLS v17AB, NDF-RT is no longer being maintained and has been replaced by the Medication Reference Terminology (MED-RT). Further documentation on MED-RT can be found in evs.

Using NDF-RT with FHIR R5


Sourcethe National Drug File - Reference Terminology - prepared by Veterans Health Administration, and distributed as part of UMLS by the NLM (direct link)
SystemThe URI to identify NDF-RT is not resolved. As a temporary arrangement, the URL "http://hl7.org/fhir/ndfrt" is to be used
VersionA version is not needed. (Use the date of the UMLS release for the version of NDF-RT if a version is desired.)
CodeThe NUI is used for the code value for an NDF-RT concept
InactiveTodo: Describe how it is determined which concepts are inactive
SubsumptionSubsumption testing is based in the Is-a relationship defined by NDFRT
Filter PropertiesNone are described yet

This URL is temporary while the NDF-RT and HL7 teams discuss the long term arrangements. Further documentation can be found in evs.

Version Issues

NDF-RT is released as part of UMLS. Therefore, each successive release has the date of the UMLS release as its version.

Copyright/License Issues

NDF-RT has no copyright acknowledgement required. However, users must adhere to the UMLS license.

NDF-RT Filter Properties

This section documents the property filters that can be used with the NDF-RT code system in value set composition statements.

By Subsumption
DescriptionSelect a set of concepts based on subsumption testing
Property Nameconcept
Operations Allowedis-a
Values AllowedNUI
CommentsIncludes all concepts that have a transitive is-a relationship with the concept Id provided in the value as an NUI (including the concept itself)

Others yet to be done.

NDF-RT Implicit Value Sets

Yet to be done.