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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

March 2019

Version: 20190301

Release Date: March 1, 2019


The March 2019 SNOMED CT United States (US) Edition release is now available for download. In addition to 410 new concepts specific for the US, the March 2019 SNOMED CT US Edition also contains all of the content from the January 2019 SNOMED CT International Edition. This release includes and updated SNOMED CT to ICD-10-CM mapping reference with over 123,000 SNOMED CT source concepts mapped to ICD-10-CM targets.


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Download Release Notes

View Release Notes

Download Mapping Refset Release Notes

MD5 hash:

RF2 package: af160d6f03bdbc8cb245ac50ab0041d1


Additional Resources

View Mapping Refset Release Notes

Download Mapping Refset Exemplar File (xlsx)

Download Mapping Refset Technical Specifications (PDF)

Download ICD10CM Human Readable Map


Announcement - To continue to align with the SNOMED CT International Edition, the US Edition will implement the following file changes starting with the September 2019 US Edition. These changes will allow for the continued efforts towards having a zip file including only data with additional supplemental documentation and artifacts available separately.

  • Deprecation of the Documentation folder
    • This aligns with the SNOMED CT International Edition release package which no longer includes a Documentation file.
  • Deprecation of the doc_Icd10MapTechnicalGuideExemplars_[date].xlsx file
  • Removal of SNOMED CT to ICD-10-CM documentation and resources from the US Edition download
    • The SNOMED CT to ICD-10-CM documentation and resources will be made available alongside the US Edition of SNOMED CT as a bundled download - SNOMED_CT_to_ICD-10-CM_Resources_YYYYMMDD.zip. The following resources will be updated for each release and bundled together and made available with each new US Edition release:
      • doc_Icd10cmMapReleaseNotes_Current-en-US_US1000124_YYYYMMDD.pdf (will be available as an online resource and in the download)
      • doc_Icd10cmMapTechnicalGuideExemplars_Current-en-US_US1000124_YYYYMMDD.xlsx
      • doc_Icd10cmMapTechnicalSpecifications_Current-en-US_US1000124_YYYYMMDD.pdf (will be available as an online resource and in the download)
      • tls_Icd10cmHumanReadableMap_US1000124_YYYYMMDD.tsv

Any questions or comments regarding these upcoming changes can be sent to NLM Customer Support https://support.nlm.nih.gov/.