SNOMED CT United States Edition

NOTE: For the SNOMED CT SARS-CoV-2/COVID-19 content, see: http://snomed.org/covid-19

September 2026

Version: 20260901

Release Date: September 1, 2026

The September 2026 SNOMED CT United States (US) Edition release is now available for download. This release contains 286 new active concepts specific to the US Extension. The September 2026 US Edition of SNOMED CT is based on the content published in the July 2026 SNOMED CT International Edition. This latest version of the US Edition also includes the SNOMED CT to ICD-10-CM reference set, with over 142,000 SNOMED CT source concepts mapped to ICD-10-CM targets.

Please note - While the SNOMED CT International Edition has moved to monthly releases, the US Edition of SNOMED CT will remain on the current bi-annual release schedule of March and September.

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MD5 hash: fe0e22a986f478fff493650e0108dc24

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Download Transitive Closure Resources

MD5 hash: 2c03fc497c12cf03d65d1cfadd37c3bb

Download SNOMED CT to ICD-10-CM Mapping Resources

MD5 hash: 1732e1ca42f666457d6a9189aa7431d6

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Announcement - Changes in the September 2026 US Edition release

• Increase to the maximum length of Description Types

  The maximum length of Fully Specified Name (FSN) and Synonym descriptions have been increased from 255 to 4096 characters starting from the July 2026 release of the International Edition (upon which this September 2026 US Edition release is dependent). The requirement for this change came from the Pharmaceutical / biologic product hierarchy, where the terming guidance for FSNs caused the previous limit to be exceeded where there is a large number of ingredients in a medicinal product, which is particularly common in multivalent vaccines.

  Although the July 2026 International Edition introduces this new capability, no descriptions were actually extended beyond 255 characters in that release; the change serves as an enabler for future editions - the September 2026 US Edition, therefore, contains only the configuration change, and not actual records exceeding the original limit. The actual implementation of the change will be reflected in the March 2027 US Edition release (as this will be dependent on an International version greater than the August 2026 International Edition), which will feature the first descriptions exceeding the previous 255-character limit. For further information, please refer to the International Edition release notes.

  From the March 2027 US Edition release onwards, therefore, FSNs, Synonyms, and Descriptions may reach a length of up to 4,096 characters. It is important to note that no further warnings regarding this change will be issued; therefore, users and implementations must be prepared to process content of this length in any release following the March 2027 US Edition.

  NOTE: Future description changes or additions will align with the updated specification of description length up to 4096 characters without early visibility of these changes.

• Notice of Deprecation - Concept Non Current Indicators

  As planned, Concept Non Current (CNC) indicators were deprecated in the January 2026 International Edition of SNOMED CT. A total of 111 CNC indicators remained active following the January 2026 International Edition release, these have been inactivated in the February 2026 International Edition release.

  The addition of CNC indicators to active descriptions on inactive concepts has now ceased. Inactive CNC indicators will be left in place as inactive components. This deprecation is not expected to have any impact on existing SNOMED CT implementations but will instead simplify the product and reduce associated maintenance costs.

  For further information please see here.