Collaborative Stage

Note 1: Histologic grading is used for stage grouping and is considered of particular importance for mucinous carcinomas (codes 8480, 8481 and 8490). Select the grade as described on the pathology report.
Note 2: For mucinous tumors, if the grade is given in a numeric two-grade system, code grade 1 of 2 as mucinous low grade (code 011) and code grade 2 of 2 as mucinous high grade (code 021). If the grade is given in a numeric three- or four-grade system, code grade 1 of 3 or 1 of 4 as mucinous low grade (code 011) and code all other numeric grades as mucinous high grade (code 021).
Note 3: For mucinous tumors, if the grade is give in descriptive terms, code "well differentiated" as mucinous low grade (code 011) and code "moderately differentiated" or "poorly differentiated" as mucinous high grade (code 021). (The term "undifferentiated" should not apply to mucinous tumors because a tumor that makes mucin is by definition differentiated into mucin-producing tumor cells.)

Code	Description
010	For NON-MUCINOUS carcinomas: well differentiated
011	For MUCINOUS carcinomas: low grade
020	For NON-MUCINOUS carcinomas: moderately differentiated
021	For MUCINOUS tumors: high grade
030	For NON-MUCINOUS carcinomas: poorly differentiated
040	For NON-MUCINOUS carcinomas: undifferentiated
988	Not applicable: Information not collected for this case
998	Patient did not have surgery No histologic confirmation
999	Unknown grade Unknown or no information Not documented in patient record

CS Site-Specific Factor 11
Histopathologic Grading