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SEER Inquiry System - Report
Produced: 05/09/2026 6:24 AM
Question 20160007
Inquiry Details
References:
2015 SEER Manual. App C
Question:
Surgery of Primary Site--Breast: If the diagnosis is a single primary involving both breasts, do we code 41 Surgery Primary site with 1 in Surgery Other site, or code 76 Surgery Primary site with 0 in Surgery Other site? See discussion.
Discussion:
In Appendix C- Breast (SEER Manual 2015) it states under the codes for TOTAL MASTECTOMY (Codes 40-49, 75): For single primaries only, code removal of involved contralateral breast under the data item Surgical Procedure/Other Site (NAACCR Item # 1294). [SEER Note: Example of single primary with removal of involved contralateral breast--Inflammatory carcinoma involving both breasts. Bilateral simple mastectomies. Code Surgery of Primary Site 41 and code Surgical Procedure of Other Site 1.] HOWEVER, underneath that it states code 76 is used for: 76 Bilateral mastectomy for a single tumor involving both breasts, as for bilateral inflammatory carcinoma. So
Answer:
Assign code 41 with 1 in surgery other site for simple mastectomy. Assign code 76 with 0 in surgery other site for a more extensive mastectomy.
