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ICD-10 Categories Not Used in ICD-O-3

As noted previously, the ICD-10 categories C00-C97 include a few categories that are either based on morphology or denote metastatic or secondary neoplasms which are described by the behavior code in ICD-O. Figure 5 shows the ICD-10 categories omitted from the topography section of ICD-O.

ICD-10 Equivalent ICD-O, Third Edition, Code

Figure 5. 10 categories omitted from the topography section of ICD-O
Category Term Site Histology Behavior
C43 Melanoma of skin C44._ M-872—M-879 /3
C45 Mesothelioma C__._ M-905 /3
C46 Kaposi's sarcoma C__._ M-9140 /3
C81-C96 Malignant neoplasms of lymphoid, hematopoietic and related tissue C00-C80 M-959-M-998 /3
C78 Secondary malignant neoplasms of respiratory and digestive systems C15-C39 M-________ /6
C79 Secondary malignant neoplasms of other specified sites C00-C14,
C40-C80
M-________ /6
D00-D09 In situ neoplasms C00-C80 M-________ /2
D10-D36 Benign neoplasms C00-C80 M-________ /0
D37-D48 Neoplasms of uncertain and unknown behavior C00-C80 M-________ /1
C97 Malignant neoplasms of independent (primary) multiple sites code each one   /3

The C81-C96 section of ICD-10 is used for malignant neoplasms of lymphoid, hematopoietic and related tissues. In ICD-O, Third Edition, these are assigned specific morphology codes and the behavior code /3. The morphology code, combined with the appropriate topography code in the range C00-C80, expresses the complete diagnosis. For example, in ICD-10, lymphocytic lymphoma of the stomach is coded C83.0. In ICD-O, small cell (diffuse) non-Hodgkin lymphoma would be coded to stomach C16.9 and the morphology to M-9670/3 (diffuse small cell lymphoma).

The C97 category in ICD-10 is not included in ICD-O as each primary site is usually coded separately. Guidelines for determining what constitutes multiple primaries vary among countries. (See section on Multiple Primary Neoplasms)