SNOMED CT Starter Guide

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The SNOMED CT International Edition is currently released twice a year monthly on the 31st of January and the 31st of Julylast day of each month. The release files are made available to Members in advance of the formal release date and Affiliate Licensees gain access either through their National Member or via the SNOMED International Affiliate Licensing system. Many Members supplement the International Edition with releases of their national Extension. The Extensions may be released at the same time as the International Edition but in some cases are released on different dates and at different intervals.

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Delta Release: 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. Note that a Delta release is not included as part of the International release but Delta release files can be generated. (See https://github.com/IHTSDO/delta-generator-tool for details.)


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There are valid use cases for each Release Type. Each International release will incorporate all three of these the Full and Snapshot Release Types, allowing users to choose the most appropriate format for their needs. Extensions should always be available as a full release and other Release Types may also be made available.

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  • Each SNOMED CT concept is held as a single row in the concept file. Each row represents a clinical concept.
  • Each description is held as a single row in the description file, and is associated with a single concept.
  • Each relationship, from a source concept to a destination concept, is held as a single row in the relationship file. Each row also refers to the concept that represents the relationship type.

In Full Release files, concepts, descriptions and relationships may be represented by more than one row. In this case each row represents the state of the component at a stated point in time.