SEER Training Modules
Corresponding Numbers in ICD-O-2
Figure 14. ICD-O, Third Edition, Rules and their Corresponding Numbersin ICD-O, Second Edition
| Subject | ICD-O | ICD-O |
|---|---|---|
| Topographic regions and ill-defined sites | A | 2 |
| Prefixes | B | 3 |
| More than one topographic category or subcategory | C | 4 |
| Topography codes for lymphomas | D | 12 |
| Topography code for leukemias | E | 13 |
| Behavior code | F | 5 |
| Grading or differentiation | G | 6 |
| Site-associated morphology | H | 8,9 |
| Compound morphology diagnoses | J | 10 |
| Coding multiple morphology terms | K | 11 |
*Notes: Second Edition rule 1 described the structure of the 10-digit code.
Second Edition rule 7 described the differences between the terms "cancer" and "carcinoma."
Second Edition rule 14 described the issues in coding multiple neoplasms.
There is no Rule I in the Third Edition to avoid possible confusion with a Rule 1.
