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National Program of Cancer Registries - page 29 / 93

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Histology Coding Rules: Colon/Rectum

7. Code the numerically higher ICD-O-3 code

Example: Descending colon lesion, clear cell adenocarcinoma and colloid adenocarcinoma

Clear cell adenocarcinoma

8310/3

Colloid adenocarcinoma

8480/3

Answer: 8480/3, colloid adenocarcinoma

Rule 7: Code the numerically higher ICD-O-3 code. This is the last rule for single tumors and should be used infrequently.

Example: The single descending colon lesion contains both clear cell adenocarcinoma and colloid adenocarcinoma. None of the previous rules applies to this situation, so the histology with the highest code should be recorded. In this case, the histology with the highest code is 8480/3, colloid adenocarcinoma.

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