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Table 1 Coding structure of the ICD-O and ICD-11

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

Neoplasm

ICD-O-3.2

ICD-11

Topography code

Morphology code

Stem code

Extension code

Well-differentiated invasive ductal carcinoma in stage 1 of the breast in the left upper outer quadrant

C50.4

8500/3a1b

2C61.0

&XK8G&XA2Q54&XS56&XS1G

  1. In the ICD-11, 2C61.0 represents invasive ductal carcinoma of the breast; XK8G represents left; XA2Q54 represents the upper outer quadrant of the breast; XS56 represents grade I; XS1G represents stage I
  2. The ICD-11 coding tool website: https://icd.who.int/devct11/icd11_mms/en/current (2022–10-25)
  3. aThe behaviour code includes 0–3, 6 and 9 corresponding to benign, uncertain whether benign or malignant, in situ, primary site malignant, metastatic site malignant, and uncertain whether primary or metastatic site malignant, respectively
  4. bThe grading codes 1 to 4 are used to designate grades I to IV, respectively
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BMC Medical Informatics and Decision Making

ISSN: 1472-6947

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