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Ontology Visits (July 2018)

# name # visits
1 Current Procedural Terminology (CPT) 97,418
2 RxNORM (RXNORM) 57,930
3 Medical Dictionary for Regulatory Activities (MEDDRA) 21,471
4 SNOMED CT (SNOMEDCT) 13,934
5 National Drug Data File (NDDF) 7,501
6 Foundational Model of Anatomy (FMA) 6,385
7 National Cancer Institute Thesaurus (NCIT) 2,247
8 National Drug File - Reference Terminology (NDFRT) 1,913
9 Logical Observation Identifier Names and Codes (LOINC) 1,480
10 Medical Subject Headings (MESH) 1,006
11 Read Codes, Clinical Terms Version 3 (CTV3) (RCD) 779
12 Veterans Health Administration National Drug File (VANDF) 766
13 International Classification of Diseases, Version 10 - Clinical Modification (ICD10CM) 711
14 International Classification of Diseases, Version 9 - Clinical Modification (ICD9CM) 442
15 International Classification of Diseases, Version 10 - Procedure Coding System (ICD10PCS) 428
16 International Classification of Diseases, Version 10 (ICD10) 389
17 World Health Organization (WHO) Adverse Reaction Terminology (WHO-ART) 340
18 National Center for Biotechnology Information (NCBI) Organismal Classification (NCBITAXON) 274
19 Online Mendelian Inheritance in Man (OMIM) 233
20 Master Drug Data Base Clinical Drugs (MDDB) 227
21 Healthcare Common Procedure Coding System (HCPCS) 192
22 Gene Ontology (GO) 81
23 Physician Data Query (PDQ) 72
24 International Classification of Primary Care (ICPC) 64
25 International Classification of Primary Care - 2 PLUS (ICPC2P) 48
26 Computer Retrieval of Information on Scientific Projects Thesaurus (CRISP) 40
27 MedlinePlus Health Topics (MEDLINEPLUS) 32
28 Coding Symbols for a Thesaurus of Adverse Reaction Terms (COSTART) 32
29 Artificial Intelligence Rheumatology Consultant System Ontology (AI-RHEUM) 16
30 Gene Ontology Extension (GO-EXT) 8
31 Nursing Interventions Classification (NIC) 0