**ICD-O-3**

[[http://codes.iarc.fr/.| Online version of ICD-O from International Agency of Research on Cancer (IARC)]]

[[https://seer.cancer.gov/icd-o-3/| Link to SEER ICD-O-3. SEER provides validation lists for “coherent” topography/morphology or site/histology combinations]]

{{:documentation:oncology:sitetype.icdo3.d20150918.xls|ICD-O-3 Validation List}}

[[http://www.who.int/classifications/icd/adaptations/oncology/en/.| Online downloadable CSV version of ICD-O-3 from WHO (does not contain 2011 ICD-O-3.1 updates) ]]

[[https://www.naaccr.org/implementation-guidelines/.| Guidance documents from NAACCR on now to implement ICD-O-3.1 ]]

[[https://training.seer.cancer.gov/coding/history/.| History of ICD-O ]]

[[http://jbiomedsem.biomedcentral.com/articles/10.1186/s13326-017-0114-4​| Mapping to ICD-10]]

[[https://www.researchgate.net/publication/288422916_Mapping_of_diagnostic_terminologies_in_oncology_using_the_NCI_Metathesaurus|Mapping of oncology diagnosis using NCI Metathesaurus]]

**Memorial Sloan Kettering (MSK) Oncotree mapping**

MSK & collaborator's tumor terminology (publicly available): http://oncotree.mskcc.org/oncotree/

Public API that maps ICDO site and histology combinations to Oncotree concepts, which at the same time are mapped to NCI Thesaurus and UMLS: http://oncotree.mskcc.org/oncotree-mappings/

An example of an API call: http://oncotree.mskcc.org/oncotree-mappings/crosswalk?vocabularyId=ICDO&conceptId=&histologyCode=8490/3&siteCode=C16.1