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The SNOMED CT International Edition is currently released twice a year monthly on the 31^st of January and the 31^st 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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