SEER Inquiry System - View
Source 1: ICD-O-3
Primary site--Small intestine: How is primary site coded for a single primary in the deuodenum and the jejunum? See discussion.
Malignancy in the jejunum and a separate malignancy in the duodenum; same histology. One primary per MP/H Other sites, M18. Is the primary site coded to the more invasive? If the stage is equal, is the primary site C179?
For small intestine, code the primary site to the location of the most invasive tumor. If the tumors are equal, code primary site C179.