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ICD-O is a dual classification with coding
systems for both topography and morphology of tumors.
The topography code describes the site of origin of
the neoplasms and uses the same 3-character and 4-character
categories as ICD-10 for malignant neoplasms (C00-C80);
this allows greater specificity for coding sites of
non-malignant neoplasms than is possible in ICD-10. The
morphology code describes the cell type of the tumor
and its biologic activity, in other words, the characteristics
of the tumor itself.
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Main Sections of ICD-O, the Third Edition
ICD-O consists of five main sections:
1. Instructions for Use
2. Topography-Numerical
List
3. Morphology-Numerical
List
4. Alphabetic Index
5. Differences in Morphology Codes between Second and Third
Editions
Abbreviations Used in ICD-O
The following abbreviations are used throughout ICD-O, the
Third Edition:
American and British Spelling
| In order to avoid repetitions
caused by differences in spelling, the American spelling
of words has been used, for example "leukemia" and "tumor"
rather than "leukaemia" and "tumour." These examples do
not present a serious problem in alphabetization. However,
when the differences in spelling, such as "esophagus"
and "oesophagus," |
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result in an appreciable separation of the two forms in the
alphabetic index, the reader seeking the British spelling under
the letter "O" is referred to the American spelling by the entry,
"Oesophagus (see Esophagus)."
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