| 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 |