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SNOMED CT United States Edition

The SNOMED CT United States (US) Edition is the official source of SNOMED CT for use in US healthcare systems. The US Edition is a standalone release that combines the content of both the US Extension and the International releases of SNOMED CT. NLM distributes the US Edition of SNOMED CT to licensed individuals via the UMLS Terminology Services. Please see the Licensing page to learn more about licensing and how to register to obtain an Affiliate License.

For additional information regarding ONC Regulations please see this ONC FAQ.

For older versions of the US Edition of SNOMED CT, please see the SNOMED CT Archives page.

Current US Edition Release

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

March 2021

Version: 20210301

Release Date: March 1, 2021


The March 2021 SNOMED CT United States (US) Edition release is now available for download. In addition to the 574 new active concepts specific to the US Extension, the March 2021 SNOMED CT US Edition also includes the SNOMED CT COVID-19 Related Content published in the January 2021 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.


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MD5 hash: 1bc98a40967dbf9be10d3295a6d2c2c8

Download | View Release Notes

MD5 hash: 21ebf6acf9f6bdffcbf5100b4556cf4b

Download Transitive Closure Resources

MD5 hash: 06b80a82a7d50a257a8f0da5a11b0bdf

Download SNOMED CT to ICD-10-CM Mapping Resources

MD5 hash: 1ea2751a484334499e1cf9077f2b8c2d

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View Technical Specifications


Announcement - New content added for 2019 novel coronavirus

As part of the ongoing global effort to tackle the Coronavirus outbreak and provide updated Coronavirus descriptions for Members and implementers, the March 2021 US Edition of SNOMED CT includes the SNOMED CT COVID-19 related content that was published in the SNOMED CT January 2021 International Edition. Please see section “2.2. COVID-19” in the SNOMED CT January 2021 International Edition - Release notes for more information.

Updates about content relating to COVID-19 can be found here SNOMED CT COVID-19 Related Content.

Last Reviewed: April 7, 2020