SNOMED CT United States Edition

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

September 2025

Version: 20250901

Release Date: September 1, 2025

The September 2025 SNOMED CT United States (US) Edition release is now available for download. This release contains 328 new active concepts specific to the US Extension. The September 2025 US Edition of SNOMED CT is based on the content published in the July 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: ba2c649ca0852648ede04baf4d325b57

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Download Transitive Closure Resources

MD5 hash: 1531f7c5d2bd3fde5d5b023f3ab29b18

Download SNOMED CT to ICD-10-CM Mapping Resources

MD5 hash: 142bf5de3907fe825dc87d3d63277f35

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Announcement - Changes in the September 2025 US Edition release

• JSON file

  A metadata file called "release_package_information.json" has been added to the US Edition package to provide additional information on the Release's contents. It can be found directly in the main package. The data included so far is mostly based on additional information on the package structure and its contents, but it also includes data describing the language refsets included in the release, etc.

• 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. Taking into account feedback received from stakeholders, the proposed changes will be implemented in July 2026.

  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.