ICD-O

The International Classification of Diseases for Oncology (ICD-O) is derived from the [ICD-O] for oncological diagnoses. The third revision of the ICD-O is currently in use. Tumors are coded in the following axes:

• topography
• morphology
• biological behavior
• differentiation

'The classification is expressed by a combination of a three- to four-digit alphanumeric topography code' (eg C01.1) 'b' a five-digit code 'XXXX / Y' , where the first four digits indicate the morphological type of the tumor and the number after the slash biological behavior. The next (optional) digit (sometimes listed second after the slash in the data collection) indicates the degree of tumor differentiation. Morphological codes ( XXXX ) are always four-digit numbers between 8000 and 9989. '

'The biological behavior code (' 'Y' ') can take the following values:'

• '0' - benign tumor
• '1' - uncertain behavior, it is not certain whether it is a benign or malignant tumor
• '2' - tumor in situ, non-invasive
• '3' - malignant tumor, primary
• '6' - malignant tumor, metastatic (not used in oncology registries)
• '9' - malignant tumor, origin cannot be determined (not used in oncology registries)

'The differentiation code has the meaning of histological grading and differentiation:'

• '1' - well differentiated
• '2' - moderately well differentiated
• '3' - poorly differentiated
• '4' - undifferentiated, anaplastic
• '9' - differentiation not specified, not specified or not applicable

'In the case of lymphomas and leukemias, the gross immunophenotype is given instead of the differentiation code in the National Cancer Registry:'

• '5' - immunoprofile corresponds to T-lymphocytes
• '6' - immunoprofile corresponds to B-lymphocytes
• '7' - immunoprofile of null cells (non-B non-T cells)
• '8' - immunoprofile corresponds to NK cells
• '9' - cell type not specified, not specified or not applicable

The classification is derived from the ICD-10 classification. Thus, the topography / localization coding for malignant neoplasms usually corresponds to the ICD-10 code. An exception is, for example, codes that already take into account the morphological type of neoplasm in ICD-10. For example, code C43.5 Malignant melanoma is code C44.3 (Torso skin) 8720/3 (Malignant melanoma NS) in ICD-O.

'Example of C24.1 encoding interpretation M-8160/32:'

• 'C24' - (malignant) neoplasm of other and unspecified parts of bile ducts
• 'C24.1' - Vater papilla tumor
• 'C24.1 8160' - cholangiocarcinoma Vater papilla
• 'C24.1 8160/3' - (malignant) cholangiocarcinoma Vater papilla
• 'C24.1 8160/32' - moderately well differentiated cholangiocarcinoma Vater papilla

Links

Related Articles

• International Classification of Diseases
• Classification systems in psychiatry

Literature

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External links

• International Classification of Diseases for Oncology, 3rd Edition (ICD-O-3)
• ICD-O on the International Association of Cancer Registries website
• Czech translation of ICD-O on the IHIS CR website