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This page is part of the FHIR Specification (v4.0.1: R4 - Mixed Normative and STU ) in it's permanent home (it will always be available at this URL). (v4.2.0: R5 Preview #1). The current version which supercedes this version is 5.0.0 . For a full list of available versions, see the Directory of published versions . Page versions: R4B R4 R3 R2

4.3.6 Using NDF-RT (the National Drug File - Reference Terminology) with FHIR

Vocabulary Work Group Maturity Level : 2 Standards Status : Trial Use

4.3.6.1 Summary

Source the National Drug File - Reference Terminology - prepared by Veterans Health Administration , and distributed as part of UMLS by the NLM ( direct link )
System The URI to identify NDF-RT is not resolved. As a temporary arrangement, the URL " http://hl7.org/fhir/ndfrt " is to be used
Version A version is not needed. (Use the date of the UMLS release for the version of NDF-RT if a version is desired.)
Code The NUI is used for the code value for an NDF-RT concept
Display ??
Inactive Todo: Describe how it is determined which concepts are inactive
Subsumption Subsumption testing is based in the Is-a relationship defined by NDFRT
Filter Properties None are described yet

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

4.3.6.2 Version Issues

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

4.3.6.3 Copyright/License Issues

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

4.3.6.4 NDF-RT Filter Properties

This section documents the property filters that can be used with the SNOMED CT code system in value set composition statements.

4.3.6.4.1 By Subsumption

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)

Others yet to be done.

4.3.6.5 Implicit Value Sets

Yet to be done.