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Unified Medical Language System® (UMLS®)

Metathesaurus - Mapping Projects

How does NLM coordinate its mapping efforts? Learn about the NLM Basic Mapping Project Assumptions.

Current NLM Mappings Efforts

MapNotes
SNOMED CT to ICD-9-CM This map is maintained by the IHTSDO and is available through the US Edition of SNOMED CT.
SNOMED CT to ICD-10-CM
This map is maintained by NLM and is available through the US Edition of SNOMED CT.
ICD-9-CM Diagnostic Codes to SNOMED CT Map This map is maintained by NLM.
ICD-9-CM Procedure Codes to SNOMED CT Map This map is maintained by NLM.
LOINC to CPT Mapping This mapping is dated 2005 and is not currently maintained.
A newer version is not available.

 

You must have an active UMLS license account to download mapping files. Need an account? Sign up on the UMLS Terminology Services (UTS) Web site.