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  Unified Medical Language 
  System® (UMLS), 
  National Library of Medicine®
The UMLS links different names and views of the same concept and identifies useful relationships between them.
Source vocabularies (including codes) and information about the UMLS are available at http://www.nlm.nih.gov/research/umls/
Question: Where can I find medical codes, such as the ICD, CPT 
  or HCUP? 
  
  Answer:    
  You can find medical codes in the: