SNOMED CT Full Text Definition

$447.50 / year

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 623 new concepts specific for the US, the September 2018 SNOMED CT US Edition also contains all of the content from the July 2018 SNOMED CT International Edition. Approximately 543 requests for terminology additions and updates were submitted via the US Content Request System (US CRS) to support US clinical health information data exchange. This latest version of the US Edition also includes the SNOMED CT to ICD-10-CM reference set, with over 123,000 SNOMED CT source concepts mapped to ICD-10-CM targets.

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

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

Reference_Set_Member_IdA field that provides the unique identifier of a component or reference set member.integerlevel : Nominal required : 1
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.integerlevel : Nominal required : 1
Concept_IdA field in the Description file that associates a term with the concept to which it applies.integerlevel : Nominal required : 1
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.integerlevel : Nominal required : 1
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).integerlevel : Nominal required : 1
Reference Set Member IdEffective DateIs ActiveModule IdConcept IdLanguage CodeType IdTermCase Significance Id
28844520192004-07-31True900000000000207008410016009en900000000000550004A decrease in lower leg circumference due to recurrent ulceration and fat necrosis causing loss of subcutaneous tissue in a patient with venous stasis disease900000000000017005
28844520192019-07-31False900000000000207008410016009en900000000000550004A decrease in lower leg circumference due to recurrent ulceration and fat necrosis causing loss of subcutaneous tissue in a patient with venous stasis disease900000000000017005
28844530122005-07-31True900000000000207008416118004en900000000000550004Introduction of a substance to the body900000000000017005
28844540182003-07-31True900000000000207008125097000en900000000000550004Domestic goat900000000000017005
28844550172003-07-31True900000000000207008125099002en900000000000550004Domestic sheep species900000000000017005
28844550172011-01-31False900000000000207008125099002en900000000000550004Domestic sheep species900000000000017005
28844560162003-07-31True900000000000207008122868007en900000000000550004An implantation of a staple900000000000017005
28844570132003-07-31True900000000000207008125085001en900000000000550004Equus subspecies900000000000017005
28844570132010-07-31False900000000000207008125085001en900000000000550004Equus subspecies900000000000017005
28844580152003-07-31True900000000000207008125671007en900000000000550004Disruption of continuity of tissue, not necessarily due to external forces; may be due to weakness in the tissue or excessive internal pressures900000000000017005