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Ontology Visits (July 2017)

# name # visits
1 Current Procedural Terminology (CPT) 81,310
2 RxNORM (RXNORM) 21,719
3 Medical Dictionary for Regulatory Activities (MEDDRA) 18,887
4 SNOMED CT (SNOMEDCT) 15,242
5 National Drug Data File (NDDF) 8,158
6 National Drug File - Reference Terminology (NDFRT) 1,773
7 National Cancer Institute Thesaurus (NCIT) 1,282
8 Logical Observation Identifier Names and Codes (LOINC) 1,149
9 Read Codes, Clinical Terms Version 3 (CTV3) (RCD) 1,116
10 Medical Subject Headings (MESH) 907
11 Foundational Model of Anatomy (FMA) 769
12 World Health Organization (WHO) Adverse Reaction Terminology (WHO-ART) 676
13 Veterans Health Administration National Drug File (VANDF) 631
14 International Classification of Diseases, Version 9 - Clinical Modification (ICD9CM) 545
15 International Classification of Diseases, Version 10 (ICD10) 451
16 International Classification of Diseases, Version 10 - Clinical Modification (ICD10CM) 330
17 Online Mendelian Inheritance in Man (OMIM) 308
18 Gene Ontology (GO) 276
19 National Center for Biotechnology Information (NCBI) Organismal Classification (NCBITAXON) 241
20 Computer Retrieval of Information on Scientific Projects Thesaurus (CRISP) 130
21 International Classification of Primary Care (ICPC) 94
22 Master Drug Data Base Clinical Drugs (MDDB) 70
23 Coding Symbols for a Thesaurus of Adverse Reaction Terms (COSTART) 59
24 International Classification of Primary Care - 2 PLUS (ICPC2P) 51
25 International Classification of Diseases, Version 10 - Procedure Coding System (ICD10PCS) 46
26 Physician Data Query (PDQ) 36
27 Artificial Intelligence Rheumatology Consultant System Ontology (AI-RHEUM) 35
28 Healthcare Common Procedure Coding System (HCPCS) 24
29 Gene Ontology Extension (GO-EXT) 17
30 MedlinePlus Health Topics (MEDLINEPLUS) 12
31 Nursing Interventions Classification (NIC) 0