SEER Inquiry System - Question 20041012 Details

System Guide

Back to Search Results

SEER Inquiry System - Report

Produced: 08/19/2025 9:00 PM

Question 20041012

Export CSV Export PDF Print

Add to Report

Inquiry Details

References:

Question:

Multiple Primaries (Pre-2007)--Colon: What is the number of primaries for a case of familial polyposis with at least three separate tumors having invasive adenocarcinoma, one in the rectum? See Discussion.

Discussion:

A patient had a total proctocolectomy and was found to have familial polyposis. At least 3 separate tumors were identified with invasive adenocarcinoma, one of which was in the rectum. Is this 2 primaries: C18.9 with 8220/3 and C20.9 with 8140/3 or is this all one primary cancer?

Answer:

For tumors diagnosed prior to 2007:

Familial polyposis is always a single primary. Code the primary site for the case example above to C199 [colon and rectum].

For tumors diagnosed 2007 or later, refer to the MP/H rules. If there are still questions about how this type of tumor should be coded, submit a new question to SINQ and include the difficulties you are encountering in applying the MP/H rules.

Cancer Site Category:

Colon

Data Item Category:

N/A

Other Category:

Multiple primaries

Year:

2004