International Classification of Diseases for Oncology

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The International Classification of Diseases for Oncology (ICD-O) is a medical classification . It represents an extension of the ICD-10 for oncology and, like it, is maintained and further developed by the World Health Organization (WHO). The current version is the ICD-O-3 first revision from 2013 (German translation February 2014).

"Chapter II New Formations" of the ICD-10 is not sufficiently precise for the classification of tumor diseases, for example in cancer registers , as it generally does not allow any statements about the histological type of a disease, for example.

Therefore a two-axis system was developed. One axis denotes the location of the tumor (topography axis, in German the localization key), the other the histological appearance of the tumor (morphology axis , histology key).

The codes of the topography axis essentially correspond to the codes in the "Malignant neoplasms" chapter of the ICD.

Examples:

  • ..
  • C18.2 Ascending colon
  • C18.3 Hepatic flexure
  • C18.4 Transverse colon
    • C18.41 Transverse colon, right third (German extension of the topographic part)
    • C18.42 Transverse colon, middle third
    • ...
  • ..

The codes of the morphology axis are also contained in the morphology part of the SNOMED and are structured as follows:

_ _ _ _ / _: Basic form of the tumor / dignity (malignancy)

Examples:

  • 8140/0 Adenoma onA (benign tumor)
  • 8140/1 Atypical adenoma (unsafe behavior, i.e. neither completely benign nor completely malignant)
  • 8140/2 Adenocarcinoma in situ onA (superficial, not yet infiltrating tumor)
  • 8140/3 Adenocarcinoma onA (infiltrating tumor)
  • 8140/6 adenocarcinoma metastasis
  • 8140/9 Unsure whether primary adenocarcinoma or adenocarcinoma metastasis

The ICD-10 code can usually be formed from the localization and histology key .
Examples:

localization histology ICD-10
C18.2 8140/0 D12.2
C18.2 8140/1 D37.4
C18.2 8140/2 D01.0
C18.2 8140/3 C18.2

Like the ICD, the German translation of the ICD-O is provided by the German Institute for Medical Documentation and Information (DIMDI).

Other systems are used to classify tumors, which describe the stage of diseases, e.g. B. the TNM classification .

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