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

March 2025

Version: 20250301

Release Date: March 1, 2025

The March 2025 SNOMED CT United States (US) Edition release is now available for download. This release contains 161 new active concepts specific to the US Extension. The March 2025 US Edition of SNOMED CT is based on the content published in the January 2025 SNOMED CT International Edition. This latest version of the US Edition also includes the SNOMED CT to ICD-10-CM reference set, with over 126,000 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: f7dacd0a987a0358ae5caea064070e05

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Download Transitive Closure Resources

MD5 hash: 9cdbd5d3c7e08fa57aa6cbd8925d0fa2

Download SNOMED CT to ICD-10-CM Mapping Resources

MD5 hash: 8e3c469e57291b424acded198829ceba

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View Technical Specifications

Announcement - Changes in the March 2025 US Edition release

• Reminder of SNOMED International proposal to increase description character limit

  SNOMED International, owners of SNOMED CT, propose to increase the maximum length of Fully Specified Name (FSN) and Synonym descriptions from 255 characters to 4096 characters. The requirement for this change has come from the Pharmaceutical / biologic product hierarchy, where the terming guidance for FSNs causes the current limit to be exceeded where there is a large number of ingredients in a medicinal product, which is particularly common in multivalent vaccines.

  There is some likelihood that implementers will have hardcoded database schemas to 255 characters, so a significant lead time is proposed before this change would take effect. The current proposal would be for the changes to be implemented in late 2025.

  It is important to note that there is absolutely no intention to increase the length of a multitude of the International Descriptions. The proposal is simply to increase the maximum possible size to 4096, in order to allow a small number of necessarily longer terms to be consumed. However, most Descriptions will remain at their current length, well below 255 characters.

  Please see the latest Q&A blog post by SNOMED International Technical Specialist Peter Groves Williams, who explains the proposed change, its potential benefits, the feedback process and timelines, and the issues that may need to be considered in such an update. You can also find the full proposal here.