SEER Inquiry System - Question 20021206 Details

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SEER Inquiry System - Report

Produced: 06/16/2026 3:25 PM

Question 20021206

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Inquiry Details

References:

SEER EOD-88, 3rd Ed

Question:

EOD-Extension--Breast: The SEER coding scheme classifies the in situ portion as less than 25% [code 14] or equal to or greater than 25% [code 15]. How do you code a pathologist's statement of "less than or equal to 25%"? See discussion.

Discussion:

"insitu ca constitutes less than or equal to 25% of the total mass."

Answer:

For cases diagnosed 1998-2003:

Code the EOD-Extension field to 14 [invasive and in situ components present, size of entire tumor coded in Tumor Size AND in situ described as minimal (less than 25%)]. The pathologist did not use a code as defined by SEER. For cases described as "less than or equal to 25%", choose the lower of the two EOD code choices.

Cancer Site Category:

Breast

Data Item Category:

N/A

Other Category:

N/A

Year:

2002