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Ontology Visits (September 2017)

# name # visits
1 Current Procedural Terminology (CPT) 68,689
2 Medical Dictionary for Regulatory Activities (MEDDRA) 14,976
3 RxNORM (RXNORM) 14,377
4 SNOMED CT (SNOMEDCT) 11,393
5 National Drug Data File (NDDF) 8,517
6 National Drug File - Reference Terminology (NDFRT) 1,590
7 National Cancer Institute Thesaurus (NCIT) 1,504
8 Read Codes, Clinical Terms Version 3 (CTV3) (RCD) 1,240
9 Medical Subject Headings (MESH) 1,165
10 Logical Observation Identifier Names and Codes (LOINC) 987
11 Veterans Health Administration National Drug File (VANDF) 795
12 International Classification of Diseases, Version 10 (ICD10) 663
13 International Classification of Diseases, Version 9 - Clinical Modification (ICD9CM) 539
14 International Classification of Diseases, Version 10 - Clinical Modification (ICD10CM) 494
15 Foundational Model of Anatomy (FMA) 321
16 Gene Ontology (GO) 249
17 National Center for Biotechnology Information (NCBI) Organismal Classification (NCBITAXON) 242
18 Healthcare Common Procedure Coding System (HCPCS) 198
19 Online Mendelian Inheritance in Man (OMIM) 181
20 World Health Organization (WHO) Adverse Reaction Terminology (WHO-ART) 133
21 International Classification of Diseases, Version 10 - Procedure Coding System (ICD10PCS) 109
22 Master Drug Data Base Clinical Drugs (MDDB) 73
23 Computer Retrieval of Information on Scientific Projects Thesaurus (CRISP) 67
24 International Classification of Primary Care (ICPC) 66
25 International Classification of Primary Care - 2 PLUS (ICPC2P) 60
26 Physician Data Query (PDQ) 48
27 Coding Symbols for a Thesaurus of Adverse Reaction Terms (COSTART) 48
28 Artificial Intelligence Rheumatology Consultant System Ontology (AI-RHEUM) 30
29 MedlinePlus Health Topics (MEDLINEPLUS) 24
30 Gene Ontology Extension (GO-EXT) 6
31 Nursing Interventions Classification (NIC) 0