SNOMED on FHIR

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Vocabulary  Work Group
Maturity Level: 5Ballot Status: Trial Use
Source

SNOMED CT is used in FHIR international standards and resources. SNOMED CT is owned, maintained and distributed by SNOMED International Image Modified. SNOMED International is the organization which publishes the International Edition of SNOMED CT. SNOMED International Members may also distribute their own SNOMED CT National Edition, which contains the international release plus local extension content and derivatives.

System
The URI http://snomed.info/sct Image Modified identifies the SNOMED CT code system.
Version

Where a code system version is used, it should be specified as a URI that represents a specific SNOMED CT Edition published on a particular date (e.g. the International Edition or a National Edition, with a version date), following the SNOMED CT URI Specification Image Modified (see note below)

Code

The following SNOMED CT artifacts are valid in the code element for the http://snomed.info/sct namespace: Concept

IDs Image Removed and Expressions Image Removed (grammar Image Removed

IDs and SNOMED CT Expressions (using SNOMED CT Compositional Grammar).
SNOMED CT Terms and Description

Ids

Identifiers are not valid as codes in FHIR, nor are other alternative identifiers associated with SNOMED CT Concepts.

Note: when SNOMED CT terms must be exchanged, use the Description Id Extension.

Display

The correct display for a SNOMED CT concept is one of the

synonyms for

terms associated with that concept. The best display is the preferred term in the relevant language or dialect, as specified in the associated language reference set

(if applicable). Preferred terms

. SNOMED CT synonyms may be case sensitive.

The Fully Specified Name is not an appropriate choice for the display. The preferred term for each concept in a given language or dialect is specified in a Language Reference Set. SNOMED CT does not define displays for expressions. If no display has been associated with the expression through a value set or other mechanism

SNOMED International does not define terms for expressions. If a SNOMED terminology producer publishes human-readable terms for expressions in an expression repository, this term may be used as the display. Similarly, if a SNOMED terminology producer publishes an official template for generating terms from an expression, a term generated using the template may be used as the display. If no term or description template has been published, the full expression with

preferred

terms embedded may be used

(using the standard syntax)

.

Note that Display is

to display the published value specific to the CodeSystem. It may not contain any term

not intended to contain terms entered by the user

. TODO Linda Bird Rob Hausam

that have not been officially published by a SNOMED CT Terminology Producer.

InactiveInactive codes are identified using the 'inactive' property (see below).
SubsumptionSNOMED CT Subsumption testing for concepts is based on the |is a| relationship defined by SNOMED CT.
Filter PropertiesSeveral filter properties are defined, as described below.

This specification publishes a canonical SNOMED CT code system resource. See also the SNOMED CT Usage Summary.

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