SNOMED CT Delta Text Definition

$179 / 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 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.

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.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
36866820192018-07-31true900000000000207008768734005en900000000000550004A person who coordinates clinical research studies.900000000000017005
36728190142018-07-31true900000000000207008767574004en900000000000550004Operation on parathyroid gland during thyroidectomy.900000000000017005
33175830122018-07-31true900000000000012004719722006en900000000000550004This attribute specifies the realization of a function900000000000017005
36515820172018-07-31true900000000000207008437251000124102en900000000000550004Increase or decrease in zinc content of the diet.900000000000017005
36870290152018-07-31true900000000000207008768821004en900000000000550004A person who coordinates the activities of a care team.900000000000017005
36502450152018-07-31true900000000000207008435721000124105en900000000000550004Increase or decrease in fibre content of the diet.900000000000017005
36502460192018-07-31true900000000000207008435721000124105en900000000000550004Increase or decrease in fiber content of the diet.900000000000017005
36515300192018-07-31true900000000000207008437081000124103en900000000000550004Increase or decrease in boron content of the diet.900000000000017005
36515340112018-07-31true900000000000207008435761000124104en900000000000550004Increase or decrease in fluid content of the diet.900000000000017005
36515360132018-07-31true900000000000207008437551000124100en900000000000550004Increase or decrease in lysine content of the diet.900000000000017005