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Ontology Visits (May 2018)

# name # visits
1 Current Procedural Terminology (CPT) 121,083
2 Medical Dictionary for Regulatory Activities (MEDDRA) 17,791
3 RxNORM (RXNORM) 14,563
4 SNOMED CT (SNOMEDCT) 14,374
5 National Drug Data File (NDDF) 8,061
6 National Drug File - Reference Terminology (NDFRT) 3,068
7 Foundational Model of Anatomy (FMA) 2,160
8 National Cancer Institute Thesaurus (NCIT) 1,381
9 Read Codes, Clinical Terms Version 3 (CTV3) (RCD) 1,288
10 Medical Subject Headings (MESH) 1,193
11 Logical Observation Identifier Names and Codes (LOINC) 1,009
12 Veterans Health Administration National Drug File (VANDF) 989
13 International Classification of Diseases, Version 10 - Clinical Modification (ICD10CM) 676
14 International Classification of Diseases, Version 10 (ICD10) 654
15 International Classification of Diseases, Version 9 - Clinical Modification (ICD9CM) 514
16 Online Mendelian Inheritance in Man (OMIM) 368
17 World Health Organization (WHO) Adverse Reaction Terminology (WHO-ART) 352
18 International Classification of Diseases, Version 10 - Procedure Coding System (ICD10PCS) 178
19 National Center for Biotechnology Information (NCBI) Organismal Classification (NCBITAXON) 134
20 Gene Ontology (GO) 133
21 Computer Retrieval of Information on Scientific Projects Thesaurus (CRISP) 117
22 Healthcare Common Procedure Coding System (HCPCS) 103
23 Master Drug Data Base Clinical Drugs (MDDB) 79
24 Artificial Intelligence Rheumatology Consultant System Ontology (AI-RHEUM) 71
25 International Classification of Primary Care (ICPC) 64
26 International Classification of Primary Care - 2 PLUS (ICPC2P) 55
27 Coding Symbols for a Thesaurus of Adverse Reaction Terms (COSTART) 47
28 Physician Data Query (PDQ) 39
29 MedlinePlus Health Topics (MEDLINEPLUS) 16
30 Gene Ontology Extension (GO-EXT) 8
31 Nursing Interventions Classification (NIC) 8