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.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
28844600182020-01-31False9000000000002070082504000en900000000000550004An autonomic plexus that is a subdivision of the celiac plexus and accompanies the pancreatic arteries900000000000017005
28844610192020-01-31False9000000000002070081431002en900000000000550004The act or operation of holding, suturing, or fastening in a fixed position900000000000017005
28844630162020-01-31False900000000000207008128207002en900000000000550004An autosomal recessive condition characterized by progressive degeneration of the central and peripheral nervous system with enlargement of axons900000000000017005
28844920172020-01-31False900000000000207008128177006en900000000000550004Skin lesion, greater than 2 cm, flat, colored; differs from a macule only in size900000000000017005
28845000172020-01-31False90000000000020700813930000en900000000000550004Detection of protein in a location it should not normally be present900000000000017005
28845030152020-01-31False90000000000020700821684005en900000000000550004An autonomic plexus that is derived from the celiac plexus, more specifically renal and hypogastric plexi, that accompanies the ureteric artery to the ureter900000000000017005
28845200162020-01-31False90000000000020700821143006en900000000000550004Traumatic hemorrhage into heel that persists as black dots900000000000017005
28845350152020-01-31False90000000000020700835328001en900000000000550004An unpaired autonomic plexus that is part of the celiac plexus that lies on the hepatic artery and its branches in the liver900000000000017005
28845410102020-01-31False90000000000020700830021000en900000000000550004Lower extremity from knee to ankle900000000000017005
28845560182020-01-31False90000000000020700840983000en900000000000550004Upper extremity between shoulder and elbow900000000000017005