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SEER Inquiry System - Report
Produced: 03/27/2026 3:00 AM
Question 20000269
Inquiry Details
References:
#1: SEER Program Code Man, 3rd Ed, 11
#2: 2004 SEER Manual, 11
Question:
Multiple Primaries (Pre-2007): Is an in situ tumor followed by another in situ tumor in the same location a new primary? See discussion.
Discussion:
Example: Six months after an in situ lesion was excised from the buccal mucosa, another in situ lesion was excised from the same area of the buccal mucosa with no mention of it being recurrent.
Answer:
For tumors diagnosed prior to 2007:
Code as a second primary if the second in situ tumor occurred more than 2 months after the first, and it is not referred to as recurrent by the clinician or pathologist. There are no special rules for determining the number of primaries when an in situ lesion follows an in situ.
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.
