1.

Clinical Finding

Inactivation of Complication Disorder Concepts

The inactivation of concepts that reference “complication” without specifying the nature of the complication is ongoing. 

2026 International Releases

2.

Procedure

Review 48537004 |Bypass graft (procedure)| 

A review of the 48537004 |Bypass graft (procedure)| hierarchy is in progress, the focus is on:

• Improving consistency of descriptions.

• Improving definitions for different types of concepts in the hierarchy (bypass vs shunt)

• Correct use of the term “graft” within the descriptions.

• Correct modeling of 260686004 |Method (attribute)| in the hierarchy.

• Review of the need for 360021005 |Bypass - action (qualifier value)| and 424208002 |Shunt - action (qualifier value)|in the model and testing of 245854003 |Proximal anastomosis (qualifier value)| and 245855002 |Distal anastomosis (qualifier value)| as new 260686004 |Method (attribute)| values in the hierarchy.

• Review for a consistent and appropriate usage of 425362007 |Surgical insertion - action (qualifier value)|and 129407005 |Grafting - action (qualifier value) in the model.

• Review for re-classification of 129376004 |Construction - action (qualifier value)| as a direct subtype of 129284003 |Surgical action (qualifier value)|.

• Given the complexity of some concepts in the hierarchy, potential duplicate, erroneous, or outdated concepts will be identified.

Q4 2026 International Release

3.

Procedure

Review of 129376004 |Construction - action (qualifier value)|

129376004 |Construction - action (qualifier value)| is a subtype of 257903006 |Repair - action (qualifier value) and sibling of 129377008 |Reconstruction - action (qualifier value)|.

Because some concepts modeled with 129376004 |Construction - action (qualifier value)| as target value concept for 260686004 |Method (attribute)| may not be considered a reparative procedure, a review of the 129376004 |Construction - action (qualifier value) and 410614008 |Construction (procedure)| hierarchies is being undertaken.

Expected outcomes may be the classification of 129376004 |Construction - action (qualifier value)| directly under 129284003 |Surgical action (qualifier value)| and the creation of new actions that better define the differences between reparative and construction procedures.

2026 International Releases

4.

Association Relationships File

Additional Relationships

The new "additional relationships" take the same form as the inferred relationships and can be stored in the same format in the RF2 package. Modeling Advisory Group (MAG) recommends that extensions can use the existing relationship files or create new relationship files for them. By default, there is a single file for each component (1 concept file, 1 relationships file, 1 simple refset file, etc.). Edition and extension publishers can decide to split the content of any of those files for business reasons while following the naming convention. The new attributes should be placed under 1295449009 |Additional relationship attribute (attribute)|. The concept 900000000000227009 |Additional relationship (core metadata concept)| should be assigned to characteristicTypeId in the relationship files.

To be determined - 2026 International Releases

5.

Description Update

Inactivation and Replacement of Concepts Using "Arm" and "Leg" in the FSN 

Concepts that use "arm" or "leg" without qualification are ambiguous, as the anatomical site may be misinterpreted. 

Work has commenced on updating Disorder content. Following this, Finding and Procedure content will be managed as resourcing permits. 

2026 International Releases

6.

Clinical Finding

Morphologic Abnormality

Procedure

Situation with Explicit Context

Remodel 128928004 |Neuroendocrine neoplasm (morphologic abnormality)| and Subtypes

128928004 |Neuroendocrine neoplasm (morphologic abnormality)| its subtypes and related concepts in other hierarchies will be revised to align with the 5th edition of the WHO Blue Book chapter on Endocrine and Neuroendocrine Tumours as well as to SNOMED CT editorial guidance as part of the Histology Content Quality Group  Please see “Neuroendocrine neoplasms (NEN) - PART 2” here for more information about these changes.

Please see the Histology Content Quality Group site here for more information about the groups’ mission.

Q4 2026 International Release

7.

ICD-O

Planned Deprecation of the SNOMED CT - ICD-O version 3.1 Morphological and Topography Maps

Please see briefing note here.

2026 International Release

8.

Clinical Finding

Changes to Hierarchy 198609003|Complication of pregnancy, childbirth and/or puerperium (disorder)|

A briefing note documenting the proposed changes for the hierarchy 198609003|Complication of pregnancy, childbirth and/or puerperium (disorder)| and descendants was shared with key stakeholders in May 2025. Feedback was received from a wide range of stakeholders.

The model for 198609003|Complication of pregnancy, childbirth and/or puerperium (disorder)| and subtypes will be updated in the international edition of SNOMED CT. The model will employ the attribute 246454002 |Occurrence (attribute)| with a value of 307159006|Pregnancy time period (qualifier value)| or a subtype. This work will aim to clarify the meaning of existing content by modeling concepts with either a maternal or fetal temporal period (and rarely both maternal and fetal).

The work will also inactivate a small number of supertype concepts such as 198609003|Complication of pregnancy, childbirth and/or puerperium (disorder)| and 362972006 |Disorder of labor / delivery (disorder)|) and utilize semantically clearer alternatives for example 1269083008 |Fetal intrapartum disorder and/or maternal disorder during intrapartum period| and 1269075002 |Maternal disorder during intrapartum period|.

October 2026 International Release

9.

Clinical Finding and Procedure

Planned Inactivation of Subtypes of 367570001|Fetal part (body structure)

 The concept model for fetal procedures and findings has been updated in the international edition of SNOMED CT. The model employs the attribute 246454002 |Occurrence (attribute)| with the value 303112003 |Fetal period (qualifier value)| and its subconcepts for modeling purposes. Finding and procedure sites have been revised to utilize canonical or morphological structures (excluding unique fetal structures) such as persistent or malformed structures. For example, concepts modeled with site 'fetal head structure' have had site replaced by 'head structure' in combination with 'fetal period' occurrence.

The 106 descendants of 367570001|Fetal part (body structure)| are currently under review. Non-unique fetal parts, such as ‘fetal head’, will be inactivated from the anatomy hierarchy. A briefing note will be published before the inactivation of anatomy content. National extensions should update the model for fetal findings and procedures to ensure consistent classification. If any subconcepts of 367570001|Fetal part (body structure)| are required for other use cases, please submit this information to info@snomed.org

2026 International Releases

10.

Organism

Review of 409793007|Antimicrobial resistant bacteria (organism)| and Descendants

409793007|Antimicrobial resistant bacteria (organism)| and descendants will be reviewed and content corrections made as appropriate.  The review will focus on:

• Aligning taxonomic lineages of resistant bacteria with those of bacterial (only) portions of the organisms hierarchy. Missing ranks including (and limited to) order, family, genus, species will be added as necessary.  Example:

  • The lineage of beta-lactam resistant Escherichia coli, beta-lactam resistant Escherichia (genus), beta-lactam-resistant Enterobacteriaceae (family), beta-lactam-resistant Enterobacterales (order).  

• Aligning organisms that are said to be resistant with corresponding antimicrobial substances hierarchy.  Example: 

  • Ampicillin < penicillin < beta-lactam

• Making the grammar and description style consistent throughout the hierarchy and compliant with the editorial style guide. The pattern “antimicrobial-resistant organism” will be maintained.  The antimicrobials themselves may be hyphenated.  

  • Examples: Ampicillin-resistant Escherichia coli

2026 International Releases

11.

Disorder

Mental Health Project Group to Review Disorder Content

For further information please see here.

2026 International Releases

12.

New Attribute

Proposal to Create New Attribute to Link Substance Hierarchy to Organism Hierarchy

Feedback is required on the level of support from the SNOMED community for the launch of a project – for further details please see this briefing note.

Project Update 27 August 2026

The attribute has now been created; however, its name and definition remain subject to refinement as part of the project. The initial work to create linkages between concepts in the Substance and Organism hierarchies, within the limited scope of microorganism nucleic acids and antigens, will be undertaken by Australia and will be subject to internal review and validation.

The attribute and the associated linkages will be promoted once the project work is complete and has been fully vetted.

2027 International Release

13.

Disorder

Proposed Update for 91302008 |Sepsis (disorder)| and Descendants

A review of “sepsis caused by organism” concepts is underway. Please see this updated briefing note.

The proposed changes include:

• Inactivation and replacement of 80 concepts where significant updates to the FSN are required. Concepts will be inactivated with the reason “Outdated” and linked to replacement concepts using the historical association “Replaced by”.

• Replacement of the use of 246075003 |Causative agent (attribute)| with 42752001 |Due to (attribute)| linked to <<40733004 |Infectious disease (disorder)|. This reflects the current understanding that sepsis results from a dysregulated host response to infection, rather than direct organ dysfunction caused by the infectious organism itself.

• Updated description patterns for replacement concepts using the format: “Sepsis due to infection caused by X organism”.

• Review and inactivation of non-synonymous descriptions, where required.

These changes are expected to improve subtype classification consistency, particularly for bacterial and viral sepsis concepts, while aligning terminology content with current clinical guidance.

November 2026 International Release

14.

Morphologic Abnormality

Disorder

Use of ‘Tumor’ in Morphology and Disorder Concepts

Work is underway to review and address inconsistencies in the use of the term ‘tumor’ in SNOMED CT disorder concepts. 
The term tumor may refer to any mass (neoplastic or non-neoplastic); therefore, neoplasm is preferred, while tumor is acceptable as a synonym. Initial analysis has identified variation in usage. Some terms appropriately reflect histologic classifications (e.g. neuroendocrine tumors aligned with WHO Blue Books), while others appear to represent legacy, outdated, or inconsistent naming.
450 disorder concepts with tumor in their FSN are being examined and will be updated where appropriate. The work is being undertaken for this Content Tracker.

Q4 2026 International Release

15.

Clinical Finding

Revision of Requested, Done, Received, Planned Concepts

Work is underway to address inconsistent modelling of request- and workflow-related content currently represented under Clinical finding. Concepts representing requested procedures (e.g. domiciliary visit requested) are valid but will be aligned to the Situation with explicit context hierarchy. In contrast, concepts representing event status (e.g. done, received) reflect outdated naming patterns that are no longer accepted, and along with report status concepts represent administrative workflow rather than clinical meaning and will be inactivated.

• X visit done/received/planned (n=29): Inactivated (administrative workflow / event status)

• X visit requested (n=26): Moved to Situation with explicit context hierarchy, with supporting procedure concepts created

• X report status (n=50): Inactivated (administrative workflow content)

This work improves alignment with editorial policy and ensures appropriate separation of clinical meaning from administrative processes.

Q4 2026 International Release

16.

Observable Entity

LOINC Observable Entity Content Promotion

Observable entity concepts from the LOINC Ontology will be promoted to the International Release of SNOMED CT when needed to define clinical findings or when meeting the guidelines outlined in “Appendix C: Process for Addition of Observable Entity Content” of the Customer Guidance for Requesting Changes to SNOMED CT.

• An annotation with an attribution will be added to these concepts. The format has the name of the originating organization and a canonical representation of the URI: “Regenstrief Institute: http://loinc.org/code”. Example: Regenstrief Institute: http://loinc.org/88462-7 .

• Descriptions originating from LOINC, e.g., LOINC long common name, will be removed during the promotion. The PT will be updated from the LOINC long common name to a SNOMED CT compliant description.

Beginning June 2026 International Release

17.

Cell Structure

Addition of Human Gene Content

Human genes and their associated chromosome bands are being added to the International release of SNOMED CT in accordance with the specifications outlined in the briefing note circulated to the SNOMED Community. HGNC-approved names and symbols — along with previously used and alias symbols — are also being incorporated into gene concepts.

Gene additions will be prioritized based on known use cases, beginning with those required to support the ongoing development of the LOINC extension. Future use cases include support for molecular diagnostic findings and genetic disease modeling. Given the large number of genes involved, additions will be phased across multiple releases.

2026 International Releases

18.

Project Group

Formation of Radiology Project Group

Please see announcement here.

2026 - 2027 International Releases

19.

Deprecation Notice

Notice of Deprecation - Concept Non Current Indicators

International Edition 20270101

All existing (inactive) Concept Non Current Indicators will be removed from both Full and Snapshot files in the International release package, from the January 2027 release onwards. 

A new package will be created and added to the “Deprecated” folder in MLDS, containing the final state of all Concept Non Current Indicator records.

For further information please see here.

January 2027 International Release

20.

Qualifer Value

Promotion of 685451010000100 |Measurement property (qualifier value)

685451010000100 |Measurement property (qualifier value)| is planned for promotion from the LOINC Extension to the International Release (IR). The subtype-supertype relationships of this concept in the LOINC Extension will also be promoted to the IR, e.g., 118594004 |Quantity concentration (property) (qualifier value)| Is a 685451010000100 |Measurement property (qualifier value)|. Some updates to the modeling of observable entity content is expected.
For more information, please see this informational briefing note.

Q4 2026 International Release

21.

Observable Entity

Improvements in Laboratory Content

Incremental improvements in the laboratory content in the observable entity hierarchy will be made starting with the June 2026 release, including:

1. Inactivation of vague and/or not clinically useful content, e.g., 414237002 |Feature of entity (observable entity)| and 396277003 |Fluid observable (observable entity)|

2. Defining existing content such as 85015001 |Blood viscosity (observable entity)|.

This will support the correct classification of current content as well as content being promoted from the LOINC Extension, and assist in modeling the measurement findings being added for the HPO Collaborative Project.

Beginning June 2026 and continuing in future International Releases

22.

Procedure

Review 423827005 |Endoscopy (procedure)|

A review of the 423827005 |Endoscopy (procedure)| hierarchy is ongoing. Changes will reflect the agreements made within the Editorial Advisory Group:

1. Consistent modeling of 423827005 |Endoscopy (procedure)| with the 260686004 |Method (attribute)| = 129433002 |Inspection - action (qualifier value)| AND 424226004 |Using device (attribute)| = << 37270008 |Endoscope, device (physical object)|

2. Consistent modeling of 363687006 |Endoscopic procedure (procedure)| using a second role group when a concurrent procedure is performed beyond the endoscopic inspection of a body structure.

3. Consistent use of the 425391005 |Using access device (attribute)| exclusively for endoluminal endoscopies where the endoscope is the device granting access to perform a secondary action. 425391005 |Using access device (attribute)| will be retired from intracavitary endoscopies, where the endoscope is not the direct device granting access to perform a secondary action.

4. Changes to the 387713003 |Surgical procedure (procedure)| GCI axiom aimed to ensure the subsumption of all intracavitary endoscopies under Surgical procedure. The GCI axiom will be modeled with the 424226004 |Using device (attribute)| = << 312032003 |Body cavity endoscope (physical object)|. This change will make the use of an incision role group to model intracavitary endoscopies unnecessary. The incision role group will be removed from the intracavitary endoscopies model.

5. Consistent use of the different types of 37270008 |Endoscope, device (physical object)| through the hierarchy. Specific endoscopes will be used following the FSN terming or when the procedure requires a specialized endoscope. i.e. when the FSN states: Endoscopic X (procedure), the broad 37270008 |Endoscope, device (physical object)| will be used. In the cases where a specific endoscope or procedure is stated, e.g. Colonoscopic X (procedure) or X using Y endoscope (procedure), the specific endoscope device will be used. If a procedure is known to be performed using a specific endoscope, the descriptions will be changed to align with that device and model with the specific scope.

6. The 116688005 |Procedure approach (attribute)| will be used according to the FSN terming following the general principle that the procedure approach attribute will not be used when the procedure is performed through the usual natural orifice, as this information is already implied in the description. However, the attribute will be included when the approach deviates from the norm or has specific clinical significance.

7. Normalization of Proximal Primitive Parents.

October 2026 International Release

23.

Clinical Finding

Revision of Nursing Findings Modeling and Descriptions

A review of approximately 300 nursing-related clinical finding concepts is underway to improve consistency of descriptions, synonym usage, and modeling for concepts containing terms such as “disability”, “reduced”, “limited”, and “limitation”. This work is part of this content tracker.

The proposed changes include:

• Removal of non-synonymous synonyms and creation of replacement concepts where required

• Standardization of disability-related descriptions and wording

• Review modeling patterns, in particular, the modeling of <<21134002 |Disability (finding)| to better reflect the concept definition

• Review and potential inactivation of ambiguous disability concepts

The work aims to improve semantic clarity, support consistent terminology modeling, and better align disability concepts with international definitions and clinical usage.

Please see this Briefing Note.

Q4 2026 International Release

24.

Disorder

Review 46742003 |Skin ulcer (disorder) and Descendants

Based on a member inquiry and a subsequent review of subtypes of 46742003 |Skin ulcer (disorder)|, modeling inconsistency has been identified in the assignment of finding sites to ulcer concepts on external body surfaces i.e.. skin-bearing parts of the body.

This affects over 800 concepts and requires a coordinated editorial decision before remediation can proceed. The work item addressed inconsistencies in modeling ulcer finding sites, particularly whether ulcers on skin-bearing regions should be classified as "Ulcer of X" or "Ulcer of skin of X," focusing on standardizing terminology and structure.

2026 International Releases

25.

Procedure, Observable entity, Clinical Finding

Revision of Content with “Serologic” or “Serology” in FSN

Content that includes “serologic” or “serology” in the FSN will be revised and/or inactivated as this is out of alignment with the editorial guidelines. This work will be carried out for this content tracker.

For further information please see this briefing note.

Q4 2026 International Release

26.

Substance

Planned Replacement of 60071009 |Human leukocyte antigen allele (substance)| and Descendants with Cell Structures

As part of the addition of human genes to the SNOMED CT cell structure hierarchy, the existing 274 descendants of 260071009 |Human leukocyte antigen allele (substance)| will be inactivated and replaced with corresponding cell structure concepts.

Each replacement allele concept will be modeled as a descendant of the appropriate HLA gene structure concept and renamed to align with the current HLA allele nomenclature maintained in the IMGT/HLA Database, which contains the official allele names recognized by the WHO Nomenclature Committee for Factors of the HLA System.

Clinical finding concepts that reference these alleles will be updated to reflect the revised nomenclature and the associated concept model changes. This work is limited to replacing existing content; no additional HLA allele concepts are planned unless a specific clinical use case is identified.  

Q4 2026 International Release

27.

Physical Object

Remodeling and Revision of Specimen Container Types 

Three attributes have been added to the MRCM for physical objects: 

• Is receptacle for 

• Has additive 

• Has separator 

A review of the concepts in physical object that pertain to specimen containers is in progress: 

1. 706437002 |Container (physical object)| will be used as the grouper concept for all container types.  

2. 706041008 |Device for body fluid and tissue collection/transfer/processing (physical object)| will be inactivated with reason non-conformance to editorial policy and replaced by 706437002 |Container (physical object)|. 

3. 434711009 |Specimen container (physical object)| will be sufficiently defined using the Is receptacle for attribute. 

4. << 337386000 |Test tube (physical object)| and << 706046003 |Specimen receptacle (physical object)| will be remodeled as subtypes of 706437002 |Container (physical object)| 

5. The physical object hierarchy will be reviewed for any other concepts that should be moved to 706437002 |Container (physical object)|, e.g. 469844003 |Ampule (physical object)| 

6. Around 180 concepts in the 706437002 |Container (physical object)| hierarchy will be remodeled using the three new attributes, along with Has compositional material and Is sterile.  

7. Around 70 new concepts requested by the eX-EHR project will be added. 

8. All concepts from other hierarchies that are impacted by this change will be reviewed. A preliminary impact analysis identified the following numbers of concepts per hierarchy that are defined using a concept that may be a container: 30 procedures, 26 of these have an attribute using device = cytology brush, 4 clinical findings and disorders. These refer to a catheter type, which would most likely not be affected by the remodelling of container types. 

For more information including the list of new concepts, please see here. 

Q4 2026 International Release

28.

Clinical Finding, Disorder

Review of Overlap or Duplication in Fetal Position, Presentation, Lie

Work will be undertaken for this member high priority Content Tracker.

Content review and updates will standardize the classification of fetal orientation, addressing the ambiguity between normal pregnancy findings and clinical disorders during labor.

The changes will focus on:

Standardizing descriptions for fetal orientation:

• Presentation: The fetal part at the lower uterine pole (e.g., vertex, face, breech).

• Position: The relation of the presenting part to an anatomic axis (e.g., occipitoanterior).

• Lie: The relation of the fetus to the long axis of the uterus (e.g., longitudinal, transverse).

Making a clearer distinction between finding and disorder - orientation is dynamic during pregnancy (finding) but often transitions into a clinical concern during labor (disorder). Modeling approach:

• Finding concepts (e.g., Malposition of fetus) will be modeled with the occurrence of 1156673006|Fetal antenatal period (qualifier value)|

• Disorder concepts (e.g., Obstructed labor) will be modeled with the occurrence of 1156682000|Maternal intrapartum period (qualifier value)|

• Clinical disorders will be explicitly modeled as being "due to" specific clinical findings, effectively using these findings to define the disorder concepts.

Q4 2026 International Release

29.

Disorder

Update of << 41370002 |Myelitis (disorder)| and <<74772000 |Meningomyelitis (disorder)|

Around 60 concepts in the << 41370002 |Myelitis (disorder)| and <<74772000 |Meningomyelitis (disorder)| subhierarchies will be remodeled to include:

• 280408000 Spinal cord tissue structure (body structure) as value of Finding site (attribute) for << 41370002 |Myelitis (disorder)|. 54 myelitis concepts already use 280408000 Spinal cord tissue structure (body structure) in their definition.

• 280408000 Spinal cord tissue structure (body structure) as value of Finding site (attribute) in one role group and 75559006 |Spinal cord meninges structure (body structure)| as value of Finding site (attribute) in the second role group for <<74772000 |Meningomyelitis (disorder)|.

Additionally, the Abscess of spinal cord concepts and Granuloma of spinal cord concepts will be remodeled so they are not longer subtypes of Myelitis.

October 2026 International Release

30.

Morphologic abnormality, Disorder

Review and update of B-cell precursor neoplasms and T-cell precursor neoplasms
The <<418152006 |Precursor B-cell neoplasm (morphologic abnormality)| and <<415156005 |Precursor T-cell neoplasm (morphologic abnormality)| hierarchies will be reviewed for alignment with editorial guidelines and the 5th edition of the WHO Blue Book sub-categories ‘Precursor B-cell neoplasms’ and ‘Precursor T-cell neoplasms.’

New morphologic abnormality concepts will be added, descriptions and relationships will be updated, and outdated concepts will be inactivated. Around 90 concepts will be revised across morphologic abnormalities and their associated disorder concepts. More information about the changes can be found here: Precursor B and T cell neoplasms .

November 2026 International Release

31.

Morphologic abnormality

Update of <<1186968006 |Malignant adenomatous neoplasm (morphologic abnormality)| and adenocarcinoma morphologic abnormality concepts

1186968006 |Malignant adenomatous neoplasm (morphologic abnormality)|and descendants (approximately 200 concepts) will be reviewed for correct hierarchical assignment and alignment with editorial guidance. Associated disorder concepts will be reviewed and updated as needed.

Adenocarcinoma morphologic abnormality concepts (approximately 125 concepts) will be reviewed to ensure correct hierarchical placement, alignment with editorial guidance, and that they are descendants of 1187332001 |Adenocarcinoma (morphologic abnormality)|. Associated disorder concepts will be reviewed and updated as needed. More information about the changes can be found here:
Malignant adenomatous neoplasm and Adenocarcinoma .

Q4 2026 International Release

32.

Pharmaceutical dose form – NEW attribute

1402355005 |Has dose form after transformation (attribute)

As requested by the DEUSG, the new attribute 1402355005 |Has dose form after transformation (attribute)| has been added for modeling dose forms that can be transformed.

Range: < 736542009 |Pharmaceutical dose form (dose form)|

This attribute can help facilitate querying of dose forms of medicinal products after transformation.

For example:

385027000 |Powder for conventional release oral suspension (dose form)|

Has dose form after transformation: 385024007 |Conventional release oral suspension (dose form)|

The attribute will be published in the September 2026 release and the content in the International edition will be updated using the new attribute for the October 2026 release. 

October 2026 International Release

33.

Substance

Update for 766763002 |Morphinane alkaloid (substance) and 766762007 |Morphinan (substance)

The parent concept of 766763002 |Morphinane alkaloid (substance)| will be updated and its 92 subtypes will be relocated, from 58505008 |Plant isoquinoline alkaloid (substance)| to 419001004 |Alkaloid (substance)|.

Similarly, 766762007 |Morphinan (substance)| will have the parent concept of 438701005 |Isoquinoline (substance)| removed.

These changes are planned because not all subtypes of morphinan and morphinane alkaloid are plant isoquinoline alkaloids or isoquinolines; they can be fully synthetic, semi-synthetic compounds derived from a plant alkaloid, salts of these compounds, or metabolites formed in the human body.

766762007 |Morphinan (substance)| will be added as a parent to 387114001 |Dextromethorphan (substance)|. This is replicated in its modifications, and will impact approximately 50 related findings/disorders, medicinal products, and clinical drugs.

Q4 2026 International Release

34.

Situation with Explicit Context

Review of Hierarchy 281667005 |Maternal history of disorder (situation)|

Work will be undertaken for this member high priority Content Tracker.

Descriptions will be revised to remove ambiguity, the new fully specified name and the preferred term will align with existing modeling and use the pattern “History of X in mother of subject.” 

Q4 2026 International Release

35.

Morphologic abnormality and Disorder

Review and Update of Lymphoid Proliferations Associated with Immune Deficiencies, HHV8 and Other Tumour-like B-cell Predominant Lesions

Around 60 concepts representing lymphoid proliferations associated with immune deficiencies, HHV8 and other tumor-like B-cell predominant lesions will be reviewed for alignment with editorial guidelines and the 5th edition of the WHO Blue Book.

New morphologic abnormality concepts will be added, descriptions and relationships will be updated, and outdated concepts will be inactivated. More information about the changes can be found here: https://conf.spaces.snomed.org/wiki/x/BYDJSQ .

Q4 2026 International Release (provisional only, subject to change)

36.

Disorder

Update Congenital Abnormal Fusion

Congenital abnormal fusion concepts that reference only a single bone will have their FSN and PT descriptions updated to clarify that they represent involvement of the specified bone in a congenital abnormal fusion rather than a complete statement of the structures involved in the fusion. Accordingly, FSNs and PTs will be changed from “Congenital abnormal fusion of X bone” to “Congenital abnormal fusion involving X bone.”

These single-bone concepts serve as groupers for congenital abnormal fusion concepts in which the specified bone is represented in the concept model.

Note: this is the first step in a series of changes to Congenital abnormal fusion and synostosis concepts to address modeling and classification errors.

Q4 2026 International Release

37.

Morphologic Abnormality and Disorder

Review Hierarchy 397400006 |Burkitt lymphoma/leukemia (morphologic abnormality)| and Associated Disorder Concepts
The <<397400006 |Burkitt lymphoma/leukemia (morphologic abnormality)| hierarchy will be reviewed for alignment with editorial guidelines and the 5th edition of the WHO Blue Book. 

Descriptions and relationships will be updated, outdated concepts will be inactivated, and new concepts will be added. Around 30 concepts will be revised across morphologic abnormalities and their associated disorder concepts.

More information about the changes can be found here: https://conf.spaces.snomed.org/wiki/x/BYAaSg .

November 2026 International Release

38.

Morphologic Abnormality and Disorder

Inactivation of 67824002 |Lymphosarcoma (morphologic abnormality)| and 189982000 |Reticulosarcoma morphology (morphologic abnormality)| with Review of Non-Hodgkins lymphoma Concepts
67824002 |Lymphosarcoma (morphologic abnormality)| and 189982000 |Reticulosarcoma morphology (morphologic abnormality)| will be inactivated as outdated and replaced by 1172592001 |Non-Hodgkin lymphoma (morphologic abnormality)|. Related disorder concepts will be updated.

In addition, terming updates are planned for non-Hodgkin lymphoma concepts. Around 130 concepts will be updated across the morphologic abnormality and disorder hierarchies.

Q4 2026 International Release (provisional only, subject to change)

39.

Disorder

Update Hierarchy 129456006|Specific enzyme deficiency (disorder)|

Specific enzyme deficiency concepts, which are mostly primitive, are being remodeled with the newly approved HAS DEFICIENCY OF attribute.  The value for this relationship is drawn from the <<90668006 |Substance with enzyme mechanism of action (substance)|.  Where the appropriate value for this relationship is not currently available, it will be added according to the current editorial policy for the addition of substance concepts.  This will affect 620 concepts.

Q4 2026 International Release

40.

Qualifier Value

Addition of Immunohistochemistry Stain Technique Concepts in the Qualifier Value Hierarchy
Around 200 new immunohistochemistry stain technique concepts will be added in the 272394005 |Technique (qualifier value)| hierarchy under a new concept "Immunohistochemistry staining technique (qualifier value)." 

These concepts can be used to represent the type of stain utilized on a slide in digital pathology. Examples include "Estrogen receptor antibody brown chromogen immunohistochemistry (qualifier value)|" and "Programmed cell death 1 ligand 1 monoclonal antibody 22c3 brown chromogen immunohistochemistry staining technique (qualifier value)." Editorial guidelines will also be developed for this area.