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Ontology Visits (November 2017)

# name # visits
1 Current Procedural Terminology (CPT) 78,315
2 SNOMED CT (SNOMEDCT) 16,634
3 Medical Dictionary for Regulatory Activities (MEDDRA) 16,631
4 RxNORM (RXNORM) 16,592
5 National Drug Data File (NDDF) 8,123
6 Foundational Model of Anatomy (FMA) 2,396
7 National Drug File - Reference Terminology (NDFRT) 2,382
8 International Classification of Diseases, Version 10 - Clinical Modification (ICD10CM) 2,133
9 International Classification of Diseases, Version 10 - Procedure Coding System (ICD10PCS) 1,425
10 Online Mendelian Inheritance in Man (OMIM) 1,388
11 National Cancer Institute Thesaurus (NCIT) 1,360
12 Read Codes, Clinical Terms Version 3 (CTV3) (RCD) 1,281
13 Logical Observation Identifier Names and Codes (LOINC) 1,226
14 Medical Subject Headings (MESH) 1,211
15 International Classification of Diseases, Version 10 (ICD10) 993
16 Veterans Health Administration National Drug File (VANDF) 935
17 International Classification of Diseases, Version 9 - Clinical Modification (ICD9CM) 696
18 World Health Organization (WHO) Adverse Reaction Terminology (WHO-ART) 423
19 Gene Ontology (GO) 240
20 Computer Retrieval of Information on Scientific Projects Thesaurus (CRISP) 190
21 National Center for Biotechnology Information (NCBI) Organismal Classification (NCBITAXON) 174
22 Healthcare Common Procedure Coding System (HCPCS) 89
23 MedlinePlus Health Topics (MEDLINEPLUS) 80
24 International Classification of Primary Care - 2 PLUS (ICPC2P) 77
25 International Classification of Primary Care (ICPC) 75
26 Physician Data Query (PDQ) 61
27 Coding Symbols for a Thesaurus of Adverse Reaction Terms (COSTART) 60
28 Artificial Intelligence Rheumatology Consultant System Ontology (AI-RHEUM) 53
29 Master Drug Data Base Clinical Drugs (MDDB) 48
30 Gene Ontology Extension (GO-EXT) 34
31 Nursing Interventions Classification (NIC) 0