Table 1 UMLS Category 0 Vocabularies, with the number of terms

AIR – AI/RHEUM – 685 terms

AOD – Alcohol and Other Drug Thesaurus – 20685 terms

CCS – Clinical Classifications Software – 1608 terms

COSTAR – Computer Stored Ambulatory Records – 3461 terms

CSP – Computer Retrieval of Inform. Scientific Projects (CRISP) – 20434 terms

DXP – DxPlain – 10113 terms

HCPCS – Health Care Financing Admin. Common Proc. Coding System – 5091 terms

HL7 – Health Level 7 Vocabulary – 635 terms

ICD9CM – International Classification of Disease: 9th Revision – 20069 terms

ICPC2P – International Classification of Primary Care – 13383 terms

ICPCBAQ – ICPC Basque translations – 695 terms

ICPCDAN – ICPC Danish translations – 723 terms

ICPCDUT – ICPC Dutch translations – 723 terms

ICPCFIN – ICPC Finnish translations – 722 terms

ICPCFRE – ICPC French translations – 723 terms

ICPCGER – ICPC German translations – 723 terms

ICPCHEB – ICPC Hebrew translations – 485 terms

ICPCHUN – ICPC Hungarian translations – 718 terms

ICPCITA – ICPC Italian translations – 723 terms

ICPCNOR – ICPC Norwegian translations – 722 terms

ICPCPOR – ICPC Portuguese – 723 terms

ICPCSPA – ICPC Spanish – 723 terms

ICPCSWE – ICPC Swedish – 723 terms

LCH – Library of Congress – 6652 terms

LNC – LOINC Logical Observations Identifiers, Names and Codes – 79522 terms

MCM – Gloss. of Meth. Terms for Clin. Epid. Stud. of Human Disorders – 43 terms

MSH – Medical Subject Headings – 516793 terms

MTH – UMLS Metathesaurus – 32072 terms

MTHHH – Metathesaurus Hierarchical HCPCS terms – 322

MTHICD9 – NLM-generated entry terms for ICD-9 18507

MTHMST – Metath. Vers. of Min. Standard Terminol Dig. Endoscopy – 1945 terms

MTHMSTFRE – MTHMST French – 1833 terms

MTHMSTITA – MTHMST Italian – 1799 terms

NCBI – National Center for Bioinformatics Taxonomy – 136466 terms

NCI – National Cancer Institute Thesaurua – 2276 terms

PDQ – Physician Data Query Online System – 19624 terms

QMR – Quick Medical Reference – 943 terms

RAM – Randolph A. Miller Clinically Related Concepts – 258 terms

RXNORM – RxNorm of National Library of Medicine – 33906 terms

SPN – Standard Product Nomenclature of U.S. Food and Drug Admin – 5064 term

SRC – UMLS Metathesaurus Source Terminologies – 695 terms

UWDA – University of Washington Digital Anatomist – 79463 terms

VANDF – U.S. Department of Veterans Affairs – 15795 terms