Description of the issue
On April 13, Jessica Bota, Senior Informatics Analyst from Apelon has notified us of a potential equivalency error found in the March 2020 SNOMED CT Canadian Edition release. After verification, this issue was confirmed.

An equivalency error has been confirmed to be present between two concepts: 22841000087100 and 22921000087102 where the defining relationship Procedure site – Direct: Upper limb structure (body structure) is the same for both concepts.

The error is characterized by a misalignment between the Fully Specified Name description for Computed tomography of abdomen, pelvis and bilateral upper limbs with contrast (procedure) and its value for Procedure site - Direct (attribute), which should have been modeled as:

• Procedure site - Direct → Structure of left upper limb
• Procedure site - Direct → Structure of right upper limb

The Computed tomography of abdomen, pelvis and upper limb with contrast (procedure) concept is properly modeled.

List of concepts
Concept ID: 22841000087100
Fully Specified Name: Computed tomography of abdomen, pelvis and bilateral upper limbs with contrast (procedure)

Concept ID: 22921000087102
Fully Specified Name: Computed tomography of abdomen, pelvis and upper limb with contrast (procedure)

Remedial Actions Taken

• The concept 22841000087100 |Computed tomography of abdomen, pelvis and bilateral upper limbs with contrast (procedure)| has been remodeled
• The March 2020 CA Edition release package has been updated and republished on the Terminology Gateway
• The main file (inside the zip file) has been renamed as follows: SnomedCT_Canadian_EditionRelease_PRODUCTION_20200331T130000Z.zip
• The error has been documented in Release Notes
• Additional quality rules have been implemented in the authoring tool.

How does this fix impact you?
If you have implemented the March 2020 release of SNOMED CA Edition and you use the subsumption or classification features in your project, you will need to implement this updated package. If you have questions or concerns regarding these errors, contact us at This email address is being protected from spambots. You need JavaScript enabled to view it. .

Thanks to Jessica and Apelon’s team for ensuring that the Canadian Edition keeps its high quality standard.