Standards Terminology
Access terminology resources, objects, and references for Standards and initiatives.
Terminology for our Standards and Initiatives
This is the main entry page for access to Terminology created and maintained by DirectTrust. This material comprises the Naming Systems, Code Systems, and Value Sets which are cited in DirectTrust published artifacts (Standards and Implementation Guides) in a convenient browsable form.
DirectTrust also maintains Artifacts, which includes Profiles and Extensions, Search Parameters, Examples, and Schemas.
On the appropriate resource-type page (e.g. Naming Systems, Extensions, etc.) click on the object name to get a downloadable copy of the resource.
Types of Terminology
Naming Systems
A naming system is a curated namespace that issues unique symbols within that namespace for the identification of concepts, people, devices, etc. It represents a “system” used within the identifier and coding data types and can be noted in a registry for other systems to find and understand. In FHIR, a naming systems is represented using the NamingSystem Resource.
Code Systems
A code system is used to declare the existence of and describe a system of codes with key properties and optionally define a part of or all of its content. Code systems define which codes (symbols and/or expressions) exist, and how they are understood. In FHIR, a code system is represented using the CodeSystem Resource.
Value Sets
A value set specifies a set of codes drawn from one or more code systems, intended for use in a particular context. A value set defines the range of coded concepts that can be populated within a coded element in a data structure. A value set expansion is the set of coded concepts resulting from applying a value set definition to a specific version of the indicated code systems. In FHIR, a value set definition is represented using the ValueSet Resource. Value set expansions are created at runtime or generated as needed for use in specific applications.
