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For additional Relevant links with regards to Content Development Information please click here Content Development Information

ItemsProposed improvement

Planned Release date

(*this is provisional only and is subject to change)


COVID-19 Content

Content relating to COVID-19 can be viewed here SNOMED CT COVID-19 Related Content

July 2021 International Release and future releases


Browse Content Changes for the July 2021 Release

The daily build is available to review changes made to content for the July 2021 release

Forthcoming concept inactivations, new concepts and changes to existing concepts can be reviewed using the tab 'Daily build.'

July 2021 International Release

Implementation of the new anatomy concept model

The completion of the revision of hierarchical relationships provides stable anatomy content and improves the quality of classification results in other hierarchies.

Over forthcoming releases, the plan is to implement the new anatomy concept model. There are almost 35,000 anatomy concepts and they will be modeled by different types of 'part of' relationships. The new model will enable us to automatically generate hierarchies to further improve quality and consistency. 

Information about the work completed in previous release for revision of IS_A relationships can be viewed here:

July 2021 International Release and future releases


MRCM Changes

Please check here for further details MRCM changes in the July 2021 release

July 2021 International Release

Quality Initiative

Information about the project can found here - Quality Initiative - Progress

Note: There are changes to the Service Level Agreement for the CRS as a result of the Quality Initiative:

July 2021 International Release


There are >3000 concepts in the organism hierarchy related to various breeds.

These concepts will be inactivated from the International release and moved to the veterinary extension. Based on the editorial guidelines, breeds are restricted to the veterinary domain. 

July 2021 International Release

Inactivation and replacement of neoplastic morphology concepts containing ICD-O-3 classification terming

Some ICD-O version 3 morphology classification codes include Not Otherwise Specified (NOS), these concepts are not acceptable in SNOMED CT as per Editorial Guidance and are not meaningful outside of the ICD-O classification context.

In the current 400177003 |Neoplasm and/or hamartoma (morphologic abnormality)| sub-hierarchy there are approximately 75 neoplastic morphology concepts containing  the terming "no International Classification of Diseases for Oncology subtype (morphologic abnormality)" and/or "no ICD-O subtype" originating from ICD-O-3 and they are utilized in the modeling of about 460 disorders in the 55342001 |Neoplastic disease (disorder)| hierarchy.

  • The concepts "no International Classification of Diseases for Oncology subtype (morphologic abnormality)" and/or "no ICD-O subtype" will be inactivated with reason Outdated (pending the development of a specific inactivation reason for classification schema entities) and replaced with either a new concept or an existing suitable target concept. This work will be carried out in liaison with the Cancer Synoptic Reporting Clinical Project Group.
    • For example:18365006 |Adrenal cortical adenoma, no International Classification of Diseases for Oncology subtype (morphologic abnormality)| has been inactivated and replaced with 1156661006 |Adrenal cortical adenoma (morphologic abnormality)|. 
  • Review and remodel of the neoplasm disorder concepts that utilize these morphologies. 
  • Identify those neoplastic morphologic abnormalities in SNOMED CT which have non-synonymous descriptions originating from ICD-O-3. Inactivate these descriptions as non-semantically equivalent and recreate them as new subtype or sibling concept including remodel of relevant disorder concepts. 
July 2021 International Release and future releases

Inactivation of 250171008 |Clinical history and observation findings (finding)|

The primitive concept 250171008 |Clinical history and observation findings (finding)| is to be inactivated for the July 2021 release.

July 2021 International Release

Inactivation of Content - Overdose/ Poisoning of undetermined intent

The Editorial Advisory Group (EAG) has recommended inactivation of concepts which refer to overdose or poisoning of undetermined intent because it is unclear what “undetermined intent” means (e.g. not asked, refused to answer, unable to answer).

Concepts which refer to overdose or poisoning of undetermined intent will be inactivated for the July 2021 International Release with a reason of Duplicate with a historical relationship to the unspecified parent.

We are also reviewing and updating the modeling for concepts in the poisoning and overdose sub-hierarchies for compliance with newly constructed templates based on feedback from the Editorial Advisory Group.

As part of this review, we are identifying and inactivating concepts that are ambiguous or that are not clinically useful.  The list of inactivated concepts can be tracked via daily build

July 2021 International Release

Cancer Synoptic Reporting

Concepts representing cancer synoptic reporting content will be added to the International release starting with the July 2021 release. 

Cancer synoptic reports are used by many member countries to record pathology examination of cancer specimens including the College of American Pathologists (US and Canada), Royal College of Pathology (UK), Royal College of Pathology Australasia (Australia, New Zealand), PALGA (The Netherlands), Swedish Society of Pathology, and others.

This content primarily encompasses observable entity concepts and also includes supporting concepts from other hierarchies, e.g. property values.

Planned areas of promotion for the July 2021 release include histologic type, histologic grade, invasion and lymph nodes. Additional promotion of content is planned for subsequent International releases. 

For more information about this project, please see the Cancer Synoptic Reporting Clinical Project Group here

July 2021 International Release and future releases

Nutrition Content

  • Addition of ~165 nutrition observable entity concepts.
  • Review and remodeling of ~140 diet (regime/therapy) concepts
  • Further information about the work of the Nutrition Care Process Clinical Project group is available here.
July 2021 International Release

Updates for Teletherapy and Teleradiotherapy Concepts

  • ~60 concepts which include "teletherapy" or "teleradiotherapy" in the FSN will be updated to include "external beam radiation therapy." Descriptions with "teletherapy" and "teleradiotherapy" will be retained.
  • ~7 concepts which include "external beam" in the FSN will be modified to include "external beam radiation therapy" in the FSN.
  • 49569001 |Consultation in teletherapy (procedure)| will be inactivated and replaced with a new concept: "Consultation in external beam radiation therapy (procedure).
July 2021 International Release

Update to 271422003 |Fit denture (procedure)|subhierarchy

  • Following discussions with the Dentistry CRG the concepts in this subhierarchy will be remodeled with the finding site of 28035005 |Structure of teeth, gums, and supporting structures (body structure)|or a subtype.
  • Ambiguous concepts will be inactivated and replaced e.g. 6502003 |Complete lower denture (procedure)| will be replaced by 1144276002 |Fitting of complete lower denture (procedure)|.
  • This will require changes to ~25 concepts, which will include ~15 inactivations.
July 2021 International Release

Supernumerary tooth content

Approximately 69 disorder concepts <<367534004 Supernumerary tooth (disorder) will be remodeled to subsume under 371136004 Disorder of tooth development (disorder) and will have the value of their 116676008 |Associated morphology (attribute) relationship changed to 91431006 |Supernumerary structure (morphologic abnormality)|.

Inactivation of 266414008 |Supernumerary tooth (morphologic abnormality) sub-hierarchy (this will be inactivation of approximately 60 concepts).

July 2021 International Release

Updates for concepts with "pacemaker"

Concepts which refer to a cardiac pacemaker but do not include "cardiac" in the FSN will be updated to include "cardiac pacemaker." If content is ambiguous as to the location of the pacemaker, then it will be inactivated and replaced.

July 2021 International Release

41969006 |Idiopathic disease (disorder)

The almost 350 disorder concepts that specify ‘idiopathic’ in the FSN will be remodeled to have 41969006 |Idiopathic disease (disorder)| as a supertype. 

July 2021 International Release

Inactivation of subtypes of 267280004 |Venous complication of pregnancy and/or puerperium (disorder)|

Classification-derived descendants of 267280004 |Venous complication of pregnancy and/or puerperium (disorder)| are being inactivated.

For example, |Superficial thrombophlebitis in pregnancy and the puerperium - delivered with postnatal complication (disorder)|

July 2021 International Release

Inactivation of 3 ambiguous concepts in the body structure hierarchy: 

303295006 |Choroidal and/or retinal structures (body structure)| 

721949003 |Structure of choroid and/or retina of left eye (body structure)| 

721948006 |Structure of choroid and/or retina of right eye (body structure)|

  • Disorder/procedure concepts which use these anatomic structures were remodeled with 2 role groups, one representing the finding site of 68703001 |Choroidal structure (body structure)| and the other for the 5665001 |Retinal structure (body structure)|.

  • Majority of modeling changes were for ‘chorioretinal’ disorder concepts, findings and procedures.

  • 3 procedures were remodeled plus one inactivation of 75278007 |Destruction of chorioretinopathy (procedure)|.

  • Approximately 54 disorder concepts were remodeled, including 53854005 |Chorioretinal scar (disorder)| and its 18 subtypes. Two concept inactivations 69811008 |Peripheral disseminated choroiditis AND chorioretinitis (disorder)| and 56787009 |Peripheral focal choroiditis AND chorioretinitis (disorder)|.

  • New anatomy concepts created 1137449006 |Structure of posterior pole of left eye (body structure)| and 1137450006 |Structure of posterior pole of right eye (body structure)|.

  • Approximately 30 clinical finding concepts were remodeled including 9 subretinal findings and 7 subretinal disorders all remodeled with a finding site of 41275009|Structure of retinal pigment epithelium (body structure)|.

July 2021 International Release and future releases.

Inactivation of 19410003 |Macrocephaly (disorder)| and 1829003|Microcephalus (disorder)|

19410003 |Macrocephaly (disorder)| has been inactivated and replaced by two concepts:

  • 1145402008 |Congenital macrocephaly (disorder)|
  • 1145403003 |Macrocephaly (finding)|

1829003|Microcephalus (disorder)| has been inactivated and replaced by two new concepts

  • 1148758003 |Congenital microcephaly (disorder)|
  • 1148757008 |Microcephaly (finding)|
July 2021 International Release

Inactivation of 34248003 |Rheumatic inflammation (morphologic abnormality)| and 103628006 |Chronic rheumatic inflammation (morphologic abnormality)|

Inactivation of 34248003 |Rheumatic inflammation (morphologic abnormality)| and 103628006 |Chronic rheumatic inflammation (morphologic abnormality)|.

Remodeled: 23685000 |Rheumatic heart disease (disorder)| and subtypes, and 195528001 |Acute rheumatic fever (disorder)| and subtypes. 

A model was developed for rheumatoid arthritis extra-articular manifestations (with expert input), and relevant concepts remodelled utilising parent concept 52661003 |Extra-articular rheumatoid process (disorder)| .

July 2021 International Release

Disorder X without Disorder Y

The vast majority of existing X without Y concepts originated from ICD-9 with the specific meaning of "X disorder without mention of Y disorder".  As the phraseology indicates a lack of data about disorder Y as opposed to a specific exclusion, this type of concept has not been included in ICD-10, nor proposed for ICD-11, except in the case of "Traumatic brain injury without open intracranial wound".  

Addition of new X without Y concepts may only be made under the following conditions:

  1. The request for new content must be accompanied by a rationale as to the difference between "X disorder without Y disorder" and "X disorder."
  2. Approval for addition is given by the Head of Terminology.

For the most part, existing X without Y concepts will be inactivated as AMBIGUOUS with a historical MAY BE relationship to "X disorder".  Exceptions to inactivation will be made on a case-by-case basis.

July 2021 International Release and future releases.

Update Descriptions for Subtypes of 418272005|Computed tomography angiography with contrast (procedure)|

Update to the descriptions for CT arteriography and CT venography concepts in the procedure hierarchy to align with the editorial guide for Computed Tomography - CT.

July 2021 International Release

Inactivation of subtypes of 77477000|Computerized axial tomography (procedure)|

303678006 |Computed tomography of regions (procedure)| has been inactivated with reason ambiguous and Possibly equivalent to 77477000 |Computerized axial tomography (procedure)|

303679003 |Computed tomography of systems (procedure)| has been inactivated with reason ambiguous Possibly equivalent to 77477000 |Computerized axial tomography (procedure)|

July 2021 International Release

Content Improvements in the Substance and Product Hierarchies

Please see briefing notes here Drugs Project 

For the July 2021 International edition of SNOMED CT, the following changes will be made:

  • Add new attribute 1149367008 |Has target population (attribute)| and transition existing instances of 860781008 |Has product characteristic (attribute)| to the new attribute.

  • Add new attribute 1149366004 |Has ingredient qualitative strength (attribute)| and transition existing instances of 860779006 |Has ingredient characteristic (attribute)| to the new attribute.

  • The existing attributes 860781008 |Has product characteristic (attribute)| and 860779006 |Has ingredient characteristic (attribute)| will no longer be used for modeling in the International Release.

  • With the introduction of the new explicit attributes, the existing concepts 860781008 |Has product characteristic (attribute)| and 860779006 |Has ingredient characteristic (attribute)| no longer conform to SNOMED CT editorial guidance as the meaning of the attributes will change with the introduction of more explicit attributes.

    • 860781008 |Has product characteristic (attribute)| and 860779006 |Has ingredient characteristic (attribute)| will be inactivated at a yet to be determined future date.

    • Users and implementers are encouraged not to use these attributes and to request addition of specific attributes to support modeling in national extensions moving forward.

The following editorial guides are now available via the SNOMED CT Document Library:

  • SNOMED CT Editorial Guide - Pharmaceutical Dose Form
  • SNOMED CT Editorial Guide - Pharmaceutical and Biologic Product (includes the Medicinal Product hierarchy)


Please contact with any inquiries.

July 2021 International Release

Content Improvements in the Physical Object Hierarchy

Please see project roadmap and briefing notes here:

Content inactivations are planned for July 2021 International release:

  • Inactivation of ~1200 physical object concepts that include use frequency (e.g., "single use catheter")
  • Inactivation of ~600 physical object concepts that include a size or dimension (e.g., "30 cm catheter")

Physical object concepts that are described as a kit or set have been inactivated with reason 'nonconformance to editorial policy' without a replacement concept. Exceptions are noted in the editorial guidelines for the Physical object hierarchy.

New attribute types for Has absorbability quality, Has surface quality, Is sterile, and Has coating material will be added for 2021-July. Existing attribute types for Has surface characteristic and Has device characteristic will be inactivated. Further details are available in the briefing note posted on the Device Project space (Devices Project) and will be added to the organizing principles in the near future.

Please contact with any inquiries.

July 2021 International Release

Planned changes to 'Co-occurrent and due to' pattern

During the implementation of the new Description Logic features a conflict was uncovered between the modeling of 'Co-occurrent and due to' and General Concept Inclusions (GCIs). This has resulted in the need to reconsider the modeling of "Co-occurrent and due' and update the Editorial Guide for this area.

The plan is to update the Editorial Guide and all concepts that are currently modeled as 'Co-occurrent and due to' starting from the July 2019 release.

July 2021 International Release and future releases



Inactivation reason of LIMITED/WAS_A is not allowed for any new content inactivations after the July 2018 release. The WAS_A association refset has not been updated thereafter.

At the Editorial Advisory Group meeting in April 2019, agreement was reached to discontinue the maintenance of WAS_A relationships when inactivating concepts that have a historical association to an inactive concept. When changes are made to a historical relationship for a concept that was previously inactivated using WAS_A, effort will be made to assign a new historical relationship that facilitates traceability of the concept (e.g. DUPLICATE or AMBIGUOUS) as opposed to NON-CONFORMANCE TO EDITORIAL POLICY.

Existing WAS_A relationships will be inactivated in a future release once a plan for batch reassignment of historical relationships has been developed. Until then, SNOMED International will not continue to use or maintain WAS_A relationships.

July 2021 International Release and future releases

Planned changes to Implantation and Insertion procedures

Work commenced on content tracker IHTSDO-175 IHTSDO-175 - Getting issue details... STATUS

Ongoing structural changes for the Procedure concepts related to the content tracker:

July 2021 International Release


Planned changes for 'Has ingredient characteristic’ and 'Has product characteristic’ and 'Has device characteristic' attributes

Based on guidance provided by the Editorial Advisory Group, the 'Has ingredient characteristic', 'Has product characteristic' and 'Has device characteristic' attributes will be refined to more specific attributes in a future release.

July 2021 International Release and future releases.

Concrete Domains and Numeric Representation

The Modeling Advisory Group is working on concrete domains and how they will be represented in the inferred RF2 relationship file format. The following is a note on the interim solution relating to concrete domain for the medicinal product model:

Numerics are represented by concepts in the Medicinal product concept model in SNOMED CT, which is an interim solution before the implementation of concrete domains to support data types, such as decimal, integer, string and date/time. We are in progress for the development of the specification for the inferred relationship file and consult with the community of practice. When they are ready, strength in medicinal product model can be transformed to concrete domains. The transformation will be completed by technical changes without impact to classification results.

The further information about current progress on Concrete Domains can be found at: 

February 2021 SNOMED CT International Edition Concrete Domains Technical Preview release available

January 2021 Technical Preview

July 2021 International Release and future releases.


Replacement of the Stated Relationship files with the new OWL Axiom refset files

A set of documentations has been developed to support the Logic Profile Enhancements. 

For any questions, please contact SNOMED International at with “OWL Axiom refset files implementation question” in the subject line. 

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