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The UMLS is not published in entirety. Instead a number of subset ontologies are extracted and published.

Name

Original Source

Secured?

Size of subset

Processing Notes

LOINC

Logical Observation Identifiers Names and Codes

 

500M

 

MedDRA

Maintenance and Support Services Organization

Requires MSSO license

193M

 

Snomed

International Health Terminology Standards Development Organization

Requires member country license

7.4G