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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

September 2022

Version: 20220901

Release Date: September 1, 2022


The September 2022 SNOMED CT United States (US) Edition release is now available for download. This release contains 662 new active concepts specific to the US Extension. The September 2022 US Edition of SNOMED CT is based on the content published in the June 2022 SNOMED CT International Edition and includes any SNOMED CT COVID-19 Related Content published in the June 2022 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 - Due to the move to monthly SNOMED CT International Edition releases, NLM will base the March US Edition of SNOMED CT on the December SNOMED CT International Edition and the September US Edition of SNOMED CT on the June SNOMED CT International Edition. Any changes to this plan will be announced via the NLM SNOMEDCT Announces listserv.

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.


Download Now!

MD5 hash: 3bc8c62d57d400c3fa8ffd6c17a92e42

Download | View Release Notes

Download Transitive Closure Resources

MD5 hash: 5143b09fa9df47431b37c319787af489

Download SNOMED CT to ICD-10-CM Mapping Resources

MD5 hash: acb78ae77448539ed3d657f3843adf59

View Release Notes

View Technical Specifications


Announcement - Changes in the September 2022 US Edition release

  1. Advanced Notice of upcoming changes to the US Edition Release Package naming convention

    From the March 2023 Release of the US Edition onwards, the RF2 package naming convention will be changing from:

    • SnomedCT_USEditionRF2_PRODUCTION_[date]T[time]Z.zip

    ...to the following:

    • SnomedCT_ManagedServiceUS_PRODUCTION_US1000124_[date]T[time]Z.zip


    So, for the March 2023 US Edition Release, for example, the RF2 package would have originally been called:

    • SnomedCT_USEditionRF2_PRODUCTION_20230301T120000Z.zip

    ...whereas from now on it will instead be called:

    • SnomedCT_ManagedServiceUS_PRODUCTION_US1000124_20230301T120000Z.zip

  2. Notice of changes to the US Edition Module Dependency Refset Specifications

    There has been discussion on the Module Dependency Refset Specifications (MDRS) records regarding dependencies not being transitive, meaning that they cannot be inferred from a chain of dependencies. For example, if module-A depends on module-B and module-B depends on module-C, the dependency of module-A on module-C must still be stated explicitly. This has not been resolved by SNOMED International, as their recent deliberations regarding the possibility of changing the specifications to make MDRS records transitive have concluded that so far, the business case for doing so is not strong enough. Therefore, the US Edition of SNOMED CT still, in theory, has missing MDRS records which should explicitly call out the dependency of the ICD-10CM map module on both Core International modules. As the new automated MDRS functionality also generates these records, it was decided to allow their introduction until SNOMED International decides to change the RF2 specifications. These records have been included in the September 2022 US Edition release by allowing the automated MDRS generation code to add 2 new records to the US Edition MDRS, explicitly calling out the dependency of the ICD-10CM map module on both Core International modules:

    • > e37cecd9-329a-4bf2-96eb-befefd9c45c3 20220901 1 5991000124107 900000000000534007 900000000000207008 20220901 20220630
    • > 5b163b38-a5e6-4430-aaaa-82663c4bca4a 20220901 1 5991000124107 900000000000534007 900000000000012004 20220901 20220630

Last Reviewed: April 7, 2020