The US Edition of SNOMED CT

The US National Release Center

• NLM: The National Library of Medicine is the United States National Release Center for SNOMED CT.
• Distribution: NLM distributes the US Edition to licensed individuals via the UMLS Terminology Services.

One release, two sources

• Standalone: The US Edition is a standalone release.
• Combined: It combines the content of the US Extension and the International releases.

Released in March and September

The International Edition is released monthly. The US Edition stays on a twice-a-year schedule.

A SNOMED CT to ICD-10-CM reference set

The US Edition includes a reference set that maps SNOMED CT concepts to ICD-10-CM. Treat it as a tool for reporting, and check how it was built before you rely on it.

Keep these in mind

• NLM is the US release center
• The US Edition is released in March and September
• It includes a map to ICD-10-CM
• Check which edition and release your systems are on

Release details checked 13 October 2026; they change with each US release (March and September).