The novel and powerful ICD-11 classification system for neoplasm coding: a comparative study with the ICD-O

Table 4 Examples of the three levels of categories in the ICD-O-3.2

First-level category		Second-level category	Most detailed category
Code range	Term	Second-level category	Most detailed category
800	Neoplasms, NOS		Neoplasm, benign^a (8000/0)
			Neoplasm, malignant^a (8000/3)
			Neoplasm, metastatic^a (8000/6)
814–838	Adenomas and adenocarcinomas		Neuroendocrine tumour, NOS^a(8240/3)
			Carcinoid, NOS^b(8240/3)
			Bronchial adenoma, carcinoid^c(8240/3)
959–972	Hodgkin and non-Hodgkin lymphomas	Hodgkin lymphomas (965–966)	Hodgkin lymphoma, NOS^a(9650/3)
959–972	Hodgkin and non-Hodgkin lymphomas	Hodgkin lymphomas (965–966)	Hodgkin granuloma^a (9661/3)
980–994	Leukaemias	Lymphoid leukaemias (981–983)	Lymphoid leukaemia, NOS^a(9820/3)
980–994	Leukaemias	Lymphoid leukaemias (981–983)	Prolymphocytic leukaemia, B-cell type^a (9833/3)

ISSN: 1472-6947