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Ontology Visits (March 2018)

# name # visits
1 Current Procedural Terminology (CPT) 78,090
2 Medical Dictionary for Regulatory Activities (MEDDRA) 23,863
3 RxNORM (RXNORM) 13,985
4 SNOMED CT (SNOMEDCT) 12,787
5 National Drug Data File (NDDF) 8,550
6 Foundational Model of Anatomy (FMA) 2,651
7 National Drug File - Reference Terminology (NDFRT) 2,232
8 Logical Observation Identifier Names and Codes (LOINC) 1,773
9 Read Codes, Clinical Terms Version 3 (CTV3) (RCD) 1,133
10 International Classification of Diseases, Version 10 - Clinical Modification (ICD10CM) 932
11 Medical Subject Headings (MESH) 784
12 National Cancer Institute Thesaurus (NCIT) 783
13 Veterans Health Administration National Drug File (VANDF) 742
14 International Classification of Diseases, Version 9 - Clinical Modification (ICD9CM) 388
15 Online Mendelian Inheritance in Man (OMIM) 316
16 International Classification of Diseases, Version 10 (ICD10) 291
17 International Classification of Diseases, Version 10 - Procedure Coding System (ICD10PCS) 263
18 World Health Organization (WHO) Adverse Reaction Terminology (WHO-ART) 224
19 National Center for Biotechnology Information (NCBI) Organismal Classification (NCBITAXON) 192
20 Master Drug Data Base Clinical Drugs (MDDB) 129
21 Gene Ontology (GO) 123
22 MedlinePlus Health Topics (MEDLINEPLUS) 111
23 Computer Retrieval of Information on Scientific Projects Thesaurus (CRISP) 95
24 International Classification of Primary Care (ICPC) 72
25 Physician Data Query (PDQ) 57
26 International Classification of Primary Care - 2 PLUS (ICPC2P) 56
27 Coding Symbols for a Thesaurus of Adverse Reaction Terms (COSTART) 51
28 Healthcare Common Procedure Coding System (HCPCS) 50
29 Gene Ontology Extension (GO-EXT) 36
30 Nursing Interventions Classification (NIC) 15
31 Artificial Intelligence Rheumatology Consultant System Ontology (AI-RHEUM) 7