SNOMED CT terminology provides a common language that enables a consistent way of indexing, storing, retrieving, and aggregating clinical data across specialties and sites of care.
SNOMED International maintains the SNOMED CT technical design, the content architecture, the SNOMED CT content (includes the concepts table, the descriptions table, the relationships table, a history table, and ICD mappings), and related technical documentation.
This document provides a summarized description of the content changes included in the January 2018 release of SNOMED Clinical Terms® (SCT) International Release.
It also includes technical notes detailing the known issues which have been identified. These are content or technical issues where the root cause is understood, and the fix has been discussed and agreed, but has yet to be implemented.
This document is available alongside the January 2018 International Edition release.
This document is written for the purpose described above and is not intended to provide details of the technical specifications for SNOMED CT or encompass every change made during the release.
The audience includes National Release Centers, WHO-FIC release centers, vendors of electronic health records, terminology developers and managers who wish to have an understanding of changes that have been incorporated into the January 2018 International Edition release.
Continuous quality improvement and enhancement of existing content is ongoing based on requests received via the Content Request System (CRS).
As well, the January 2018 International Release has seen a continuation of the work driven by contributions from: Kaiser Permanente Convergent Medical Terminology (CMT), Global Medical Device Nomenclature Agency (GMDNA), World Health Organization (WHO) ICD-11 Beta and International Classification for Nursing Practice ( ICNP®) to add new content to SNOMED CT.
Additionally, member-identified priority projects, have driven enhancements in the anatomy hierarchy, while other project-driven changes have resulted in new content additions and enhancements to existing content detailed below.
Summary of quality improvement changes to existing content
|SCT Improvement Statistics to Existing Concepts||Number|
|Total number of changes||21076|
|Change to stated concept definition||7597|
|Change to inferred concept definition||15635|
|Change in concept definition status from Primitive to Sufficiently Defined||796|
In total: 4979 new concepts were added
|SCT Statistics||New concept additions|
|SNOMED CT Concept (SNOMED RT+CTV3)||4979|
|Body structure (body structure)||571|
|Clinical finding (finding)||2005|
|Observable entity (observable entity)||52|
|Pharmaceutical / biologic product (product)||10|
|Physical object (physical object)||171|
|Qualifier value (qualifier value)||420|
|Record artifact (record artifact)||115|
|SNOMED CT Model Component (metadata)||29|
|Situation with explicit context (situation)||91|
|Social context (social concept)||10|
|Staging and scales (staging scale)||13|
A total of ??????? new concepts were added as follows:
Diagnostic Imaging - approximately 363 new concepts added including:
105 new SNOMED CT concepts created for LOINC - SNOMED collaboration project.
8 new morphologic abnormality concepts added and then mapped to International Classification of Diseases for Oncology Third Edition (ICD-O First Revision, or ICD-O-3.1) 2011
Added >??????? new descriptions with "medication" where "drug" was already used
For further details on the planned changes in this area, please refer to the Drug Model Working Group Directory section.
Please note, you may have to register for Confluence user account in order to access this project.
Summary of changes
|New semantic tags|
New attribute types
|Attribute description changes|
|Medicinal product (MP)|
|Medicinal product form (MPF)|
|Clinical drug (CD)|
No significant changes for this release.
30 new concepts were added.
For further details on the planned changes in this area, please refer to the Substances project.
Please note, you may have to register for Confluence user account in order to access this project.
Descriptions that are inactivated in the International Edition will use one of the following four values:
In order to align in accordance with the RF2 specification, a technical batch change was made to the case significance value for over 760,000 descriptions.
For further details please refer to the document linked here: IHTSDO-950 Update of case significance assignment following the RF2 specification
Following the recommendation from Modeling Advisory Group, four new concepts have been added to support the development of OWL axiom reference set:
|Before||<< 71388002 |Procedure (procedure)||
|Component||<< 123037004 |Body structure (body structure)| OR << 410607006 |Organism (organism)| OR << 105590001 |Substance (substance)| OR << 123038009 |Specimen (specimen)| OR << 260787004 |Physical object (physical object)| OR << 373873005 |Pharmaceutical / biologic product (product)| OR << 419891008 |Record artifact (record artifact)||
|Due to||<< 404684003 |Clinical finding (finding)| OR << 272379006 |Event (event)| OR << 71388002 |Procedure (procedure)||
|During||<< 71388002 |Procedure (procedure)||
|During AND/OR after||<< 404684003 |Clinical finding (finding)| OR << 71388002 |Procedure (procedure)||
|Finding context||<< 410514004 |Finding context value (qualifier value)|||Finding with explicit context (situation)|
|Finding informer||<< 420158005 |Performer of method (person)| OR << 419358007 |Subject of record or other provider of history (person)| OR << 444018008 |Person with characteristic related to subject of record (person)|||Clinical finding|
|Has basis of strength substance||< 105590001 |Substance (substance)|||Pharmaceutical / biologic product (product)|
|Has disposition||< 726711005 |Disposition (disposition)||
|Has interpretation||<< 260245000 |Finding values (qualifier value)| OR << 263714004 |Colors (qualifier value)|||Clinical finding|
|Has presentation strength denominator unit||< 258666001 |Unit (qualifier value)|||Pharmaceutical / biologic product (product)|
|Has presentation strength denominator value||< 260299005 |Number (qualifier value)|||Pharmaceutical / biologic product (product)|
|Has presentation strength numerator unit||< 258666001 |Unit (qualifier value)|||Pharmaceutical / biologic product (product)|
|Has presentation strength numerator value||< 260299005 |Number (qualifier value)|||Pharmaceutical / biologic product (product)|
|Pathological process||263680009 |Autoimmune (qualifier value)| OR << 441862004 |Infectious process (qualifier value)| OR << 472963003 |Hypersensitivity process (qualifier value)| OR << 308490002 |Pathological developmental process (qualifier value)|||Clinical finding|
|Temporally related to||<< 404684003 |Clinical finding (finding)| OR << 71388002 |Procedure (procedure)||
The SNOMED CT to the International Statistical Classification of Diseases and Related Health Problems, Tenth Revision (© World Health organisation 1994) 2016 Version map (SNOMED CT to ICD-10 Map) is included in the SNOMED CT International release as a Baseline. The SNOMED CT to ICD-10 Map was created to support the epidemiological, statistical and administrative reporting needs of SNOMED International member countries and WHO Collaborating Centres.
The SNOMED CT to ICD-10 Map is released in Release Format 2 (RF2) only. It is located in the file der2_iisssccRefset_ExtendedMapFull_INT_20170131.txt, which is in the Map folder under Refset, in each of the three RF2 Release Type folders.
The SNOMED CT to ICD-10 Map is released as Refset 447562003 |ICD-10 complex map reference set (foundation metadata concept)|.
The map is a directed set of relationships from SNOMED CT source concepts to ICD-10 target classification codes. The SNOMED CT source domains for the MAP are limited to subtypes of 404684003 |clinical finding|, 272379006 |event| and 243796009 |situation with explicit context|. The target classification codes are ICD-10 2016 release.
The map provided for the January 2018 release has been updated, and now represents a complete map from SNOMED CT International release to ICD-10 2016 version.
We would welcome feedback on any issues that users of the map may detect when using the map. Issues should be submitted via firstname.lastname@example.org
Known Issues are content or technical issues where the root cause is understood, and the resolution has been discussed and agreed but has yet to be implemented. This can be due to a number of reasons, from lack of capacity within the current editing cycle, to the risk of impact to the stability of SNOMED CT if the fix were to be deployed at that stage in the Product lifecycle.
For the Snomed CT January 2018 International edition, the following Known Issues were identified, and agreed to be resolved in the next editing cycle (to be published in January 2018):
Resolved issues are Known Issues which were not fixed as part of the previous release lifecycle, but which have now been resolved in the latest release - in this case the January 2018 International Edition. They can also be issues found during the Alpha and Beta testing of the current release, which were resolved before the final deployment of the associated Member release. Finally they can be issues which were reported or found during the testing phase, but which have been closed without any action taken.
The Resolved Issues for the Snomed CT January 2018 International edition can be found here:
The incorrect assignment of case significance for descriptions has been fixed according to the RF2 specification. The issue was that the value 900000000000448009 |Entire term case insensitive| had not been used due to the data migration from RF1 and limitation of authoring tools. In fact, a majority of SNOMED CT descriptions should have been ‘Entire term case insensitive’. These terms can be freely switched to lower or upper case without impact to meaning. The technical batch changes have therefore been made to the case significance value to address this issue. For full details please see the document here: IHTSDO-950 Update of case significance assignment following the RF2 specification
For future reference, the RF2 package convention dictates that it contains all relevant files, regardless of whether or not there is content to be included in each particular release. Therefore, the package contains a mixture of files which contain both header rows and content data, and also files that are intentionally left blank (including only a header record). The reason that these files are not removed from the package is to draw a clear distinction between
This allows users to easily distinguish between files that have purposefully been removed or not, as otherwise if files in option 2 above were left out of the package it could be interpreted as an error, rather than an intentional lack of content in that release.
Please see the following page for details of all upcoming changes planned for January 2018 and beyond: Early Visibility - Planned improvements to upcoming SNOMED International Release packages
NOTE: To access any of the links in the pdf document, please visit the Release Notes online here:
Draft Amendment History