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The OWL representation of SNOMED CT makes use of URIs for identifying Concepts, the previously-implicit grouping role, and the ontology itself (i.e. , the set of axioms).

The old pattern used for Concepts was

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Resource

URI

Example

SNOMED CT Edition

http://snomed.info/sct/{moduleId}

http://snomed.info/sct/900000000000207008

SNOMED CT International Edition

SNOMED CT Version

http://snomed.info/sct/{moduleId}/version/{effectiveTime}

http://snomed.info/sct/900000000000207008/version/20120131

SNOMED CT International January 2012 Version

Module

http://snomed.info/module/{moduleId}

http://snomed.info/module/900000000000207008

SNOMED CT Core Module (only)

A specific release of a Module

http://snomed.info/module/{moduleId}/time/{timestamp}

http://snomed.info/module/900000000000207008/time/20120131

SNOMED CT Core Module (only) with respect to the timestamp 20120131

SCTID

http://snomed.info/id/{sctid}

http://snomed.info/id/449650002

UUID

http://snomed.info/id/{uuid}

http://snomed.info/id/00000692-31c5-81a8-2e54b488c824

Table Field

http://snomed.info/field/{table name}.{field name}

http://snomed.info/field/Relationship.characteristicTypeId

Map

http://snomed.info/id/{map sctid}

http://snomed.info/id/900000000000498005

A map is just a reference set in a specific format

Map version

http://snomed.info/sct/{moduleId}/version/{effectiveTime}/id/{map sctid}

http://snomed.info/sct/900000000000207008/version/2012013/id/900000000000498005

Refset

http://snomed.info/id/{refset sctid}

http://snomed.info/id/900000000000498005

Refset version

http://snomed.info/sct/{moduleId}/version/{effectiveTime}/id/{refset sctid}

http://snomed.info/sct/900000000000207008/version/2012013/id/900000000000498005

Role Group

http://snomed.info/id/609096000

http://snomed.info/id/609096000

 

Identifying SNOMED CT Versions in HL7

Traditionally, HL7 has used OIDs to identify Code Systems. The OID for SNOMED CT is 2.16.840.1.113883.6.96. This is the OID that should be used for all versions of SNOMED CT and related terminologies (such as the Australian Medicines Terminology) because it identifies the system, i.e. , the set of rules for interpreting SCTIDs. Under these rules, any specific SCTID is either defined with respect to a particular SNOMED CT Version, or it is undefined (i.e. , not included/mentioned in that version). Furthermore, any given SCTID always identifies the same thing in all versions in which it is defined.

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http://snomed.info/sct/{sctid}/version/{timestamp}

For example, here is how a CDA document with an element of CD Data Type CD might appear in a CDA document with:

<xyz code="78835011000036104" codeSystem="2.16.840.1.113883.6.96" codeSystemName="Australian Medicines Terminology (AMT)" codeSystemVersion= "http://snomed.info/sct/900062011000036108/version/20121231" displayName="GANFORT 0.03% / 0.5% eye drops: solution, 3 mL"/> </xyz>

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Identifying SNOMED CT Versions in HL7 FHIR

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