SNOMED CT Delta Description

$179 / year

The Description file holds descriptions that describe SNOMED CT concepts. A description is used to give meaning to a concept and provide well-understood and standard ways of referring to a concept. 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.


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 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 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.

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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

Description_IdUniquely identifies the description.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 the concept's state was active or inactive from the nominal release date specified by the Effective_Datebooleanrequired : 1
Module_IdIdentifies the description version's module.integerlevel : Nominal required : 1
Concept_IdIdentifies the concept to which this description belongs. Note that versions of descriptions and concepts don't belong to each other. Which version of any given description is combined with which version of its owning concept depends on the point in time at which they are accessed.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_IdIdentifies whether the description is an FSN, Synonym or other description type.integerlevel : Nominal required : 1
TermThe description version's text value.string-
Case_Significance_IdIdentifies the concept enumeration value that represents the case significance of this description version. For example, the term may be completely case sensitive, case insensitive or initial letter case insensitive.integerlevel : Nominal required : 1
Description IdEffective DateIs ActiveModule IdConcept IdLanguage CodeType IdTermCase Significance Id
2990112020-01-31False900000000000207008127011001en900000000000013009Diabetic sensory polyneuropathy900000000000448009
3300112020-01-31False900000000000207008127042006en900000000000013009Sickle cell-beta^+^-thalassemia900000000000448009
4070162020-01-31True900000000000207008127119001en900000000000013009Juxtaintestinal lymphadenopathy900000000000448009
10800172020-01-31True900000000000207008127793005en900000000000013009Alpha-2 antiplasmin functional assay900000000000448009
12170152020-01-31True900000000000207008127930004en900000000000013009Prevascular/retrotracheal lymph node900000000000448009
21810182020-01-31True900000000000207008669007en900000000000013009Vaccinia virus vaccine900000000000448009
28690152020-01-31True9000000000002070081060002en900000000000013009Jacquard card cutter900000000000448009