This is the Americanized Version of Clinical Terms Version 3 (CTV3).
The Read Codes, now known as Clinical Terms, are included in the Metathesaurus. For more information about Read Codes in the Metathesaurus, see the CTV3 source synopsis.
Metathesaurus Update Frequency
The Americanized Version of CTV3 was last updated in the Metathesaurus in 2000.