SNOMED CT Delta OWL Expression Reference Set

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This dataset is an OWL (Ontology Web Language) ontology reference set (foundation metadata concept), in which the OWL expressions represent essential information about an ontology. This information includes namespaces, ontology URI (Uniform Resource Identifier), ontology version URI, and import statements. An OWL expression type reference set associates description logic statements with SNOMED CT (Systematized Nomenclature of Medicine Clinical Terms) concept in the OWL functional syntax.


SNOMED CT (SNOMED Clinical Terminology) provides a common language that assists with the electronic exchange of clinical health information. It enables a consistent way of indexing, storing, retrieving, and aggregating clinical data across specialties and sites of care. SNOMED CT Can be mapped to other coding systems, such as ICD-10 (International Classification of Diseases, Tenth Revision, Clinical Modification), which helps facilitate semantic interoperability.

A Delta release contains only those component versions created, inactivated or changed since the previous release. The ‘Delta’ release is much smaller than a ‘Full’ release and is ideal for updating a ‘Full’ release of the previous version. Adding a ‘Delta’ release to the previous version’s ‘Full’ release will update the installation to a ‘Full’ release of the current Version.

In addition to 363 new concepts specific for the US, the March 2018 SNOMED CT US Edition also contains all of the content from the January 2018 SNOMED CT International Edition. Approximately 200 requests for terminology additions and updates were submitted via the US Content Request System (US CRS) to support US clinical health information data exchange.

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Last Modified




Update Frequency


Temporal Coverage


Spatial Coverage

United States


John Snow Labs; International Health Terminology Standards Development Organisation (IHTSDO), U.S. National Library of Medicine (NLM);

Source License URL

Source License Requirements

Reporting Requirements

Source Citation



Clinical Terminology, SNOMED CT, IHTSDO, Systematized Nomenclature of Medicine Clinical Terms, Healthcare Terminology, Electronic Health Records, Machine Readable Concept Model, Ontology Web Language (OWL)

Other Titles

SNOMED CT United States Edition, SNOMED CT Latest Version, Machine Readable Concept Model of SNOMED CT

Reference_Set_Member_IdA field, uniquely identifying this reference set member. Different versions of a reference set member share the same id but have different Effective_Date. This allows a reference set member to be modified or made inactive (i.e. removed from the active set) at a specified date.stringrequired : 1
Effective_DateThe inclusive date at which this version of the identified reference set member became the current version.daterequired : 1
Is_ActiveThe state of the identified reference set member as at the specified Effective_Date. If "true", the reference set member is part of the current version of the set, if "false" the reference set member is not part of the current version of the set.booleanrequired : 1
Module_IdIdentifies the SNOMED CT module that contains this reference set member as at the specified Effective_Date.integerlevel : Nominal required : 1
Refset_IdIdentifies the reference set to which this reference set member belongs.integerlevel : Nominal required : 1
Referenced_Component_IdThe identifier of the source component of the association. The concept to which the OWL expression applies. In the case of the 733073007 |OWL axiom reference set (foundation metadata concept)|, the axiom contributes to the definition of the identified concept.integerlevel : Nominal required : 1
OWL_ExpressionRepresent essential information about an ontology. This information includes namespaces, ontology URI, ontology version URI, and import statements.stringrequired : 1
Reference Set Member IdEffective DateIs ActiveModule IdRefset IdReferenced Component IdOWL Expression
8007cf74-f64e-4233-8f95-c57de64588582020-07-31True900000000000207008733073007262706001EquivalentClasses(:262706001 ObjectIntersectionOf(:64572001 ObjectSomeValuesFrom(:609096000 ObjectIntersectionOf(ObjectSomeValuesFrom(:116676008 :35933005) ObjectSomeValuesFrom(:363698007 :54785003))) ObjectSomeValuesFrom(:609096000 ObjectSomeValuesFrom(:42752001 :773760007))))
80083730-c7e4-4923-b876-eba81db5c1a32020-07-31True900000000000207008733073007254490002EquivalentClasses(:254490002 ObjectIntersectionOf(:64572001 ObjectSomeValuesFrom(:609096000 ObjectIntersectionOf(ObjectSomeValuesFrom(:116676008 :108369006) ObjectSomeValuesFrom(:363698007 :360893002)))))
8008d2f6-1124-4d6e-9131-66b5a04e896d2020-07-31True900000000000207008733073007362673003SubClassOf(:362673003 :58602004)
8009576c-0a74-437d-a994-a3a68e3cb4952020-07-31True900000000000207008733073007833302006SubClassOf(:833302006 :726711005)
8009909d-cb30-475d-b13a-2821c4611ead2020-07-31True900000000000207008733073007126113007SubClassOf(:126113007 ObjectIntersectionOf(:126090008 :81118006 ObjectSomeValuesFrom(:726542003 :734682005)))
800ae110-064a-48d2-9a28-d14a6ab225f12020-07-31True900000000000207008733073007245586004SubClassOf(:245586004 ObjectIntersectionOf(:245564000 :304571003 :422366003 :423185002 ObjectSomeValuesFrom(:272741003 :7771000)))
800b65b1-4de6-4def-804d-9409d34f46292020-07-31True900000000000207008733073007788587000SubClassOf(:788587000 ObjectIntersectionOf(:445536008 ObjectSomeValuesFrom(:609096000 ObjectSomeValuesFrom(:260686004 :129265001))))
800c34a6-a7a8-4d4a-9056-aacada148b242020-07-31True900000000000207008733073007703429003EquivalentClasses(:703429003 ObjectIntersectionOf(:64572001 ObjectSomeValuesFrom(:609096000 ObjectIntersectionOf(ObjectSomeValuesFrom(:116676008 :74532006) ObjectSomeValuesFrom(:246454002 :41847000) ObjectSomeValuesFrom(:363698007 :280951005)))))
800e8a02-bc75-43da-a93c-9b6eb688ff9e2020-07-31True900000000000207008733073007317949002SubClassOf(:317949002 ObjectIntersectionOf(:22577007 :245243003 :6989001 :72666007))
80139a11-0968-4bc9-a392-558c73d60c6e2020-07-31True900000000000207008733073007424168005SubClassOf(:424168005 ObjectIntersectionOf(:13152008 :65847000 :871491005))