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SEER Inquiry System - Report
Produced: 10/18/2025 11:09 PM
Question 20071062
Inquiry Details
References:
2007 SEER Manual, 69
Question:
Primary Site: For malignant gastrointestinal tumors (GISTs), how should the primary site be coded and which Collaborative Stage and TNM staging schemes should be used for disease found in the stomach, small intestine or other locations?
Discussion:
Answer:
This answer was provided in the context of CSv1 coding guidelines. The response may not be used after your registry database has been converted to CSv2.Code the primary site to the location where the GIST originated. If the primary site cannot be determined, assign code C809 [Unknown primary site].
GIST of gastrointestinal hollow viscera cannot be staged in TNM.
In Collaborative Staging, use the stomach scheme for GIST of the stomach. Use the small intestine scheme for GIST of the small intestine. For GIST of other primary sites, use the CS scheme for the specific site.
Cancer Site Category:
N/A
Data Item Category:
Primary site
Other Category:
N/A
Year:
2007
