SNOMED CT Full Text Definition

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This dataset describes the Release File structure of SNOMED CT, referred to as Release Format 2 (RF2). The US Edition of SNOMED CT is the official source of SNOMED CT for use in US healthcare systems. The US Edition is a standalone release that combines the content of both the US Extension and the International release of SNOMED CT.


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, which helps facilitate semantic interoperability.

A Full release contains every version of every component that has ever been released prior to or in the specified Edition. This release provides a full historical record and can be used to obtain views of the state of any component at any point in time since its first release.

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.

Date Created


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

John Snow Labs Standard License

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

Other Titles

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

Name Description Type Constraints
Reference_Set_Member_IdA field that provides the unique identifier of a component or reference set member.integerrequired : 1 level : Nominal
Effective_DateSpecifies the inclusive date at which the component version's state became the then current valid state of the componentdaterequired : 1
Is_Activespecifies whether an identified component or is an active from the point in time specified by the Effective_Datebooleanrequired : 1
Module_IdA field in each component release file which represents the development module within which it was created and is maintained.integerrequired : 1 level : Nominal
Concept_IdA field in the Description file that associates a term with the concept to which it applies.integerrequired : 1 level : Nominal
Language_CodeSpecifies the language of the description text using the two character ISO -639-1 code. Note that this specifies a language level only, not a dialect or country code.stringrequired : 1
Type_IdA field in the Description and Relationship Release Files which contains a SNOMED CT identifier that represents the type of Description or Relationship represented.integerrequired : 1 level : Nominal
TermA text string that represents the concept referenced by the Concept_Id field in the Description file.stringrequired : 1
Case_Significance_IdA field in the Description Release File containing a SNOMED CT identifier that indicates whether the text of the term can be modified to by switching characters from upper to lower case (or vice-versa).integerrequired : 1 level : Nominal
28849890102003-07-31true90000000000020700815778005en900000000000550004Goose genus900000000000017005
28849900182003-07-31true900000000000207008396620009en900000000000550004Duck genus900000000000017005
33123400142016-07-31true900000000000207008718460007en900000000000550004Polish NRC900000000000017005
28849060172003-07-31true900000000000207008388393002en900000000000550004Swine genus900000000000017005
33123400142017-07-31false900000000000207008718460007en900000000000550004Polish NRC900000000000017005
28849040192003-07-31true900000000000207008388168008en900000000000550004Cattle genus900000000000017005
28844540182003-07-31true900000000000207008125097000en900000000000550004Domestic goat900000000000017005
33082940192016-07-31true900000000000207008717051009en900000000000550004eSuisse Health900000000000017005