An official website of the United States government
Home
SEER Inquiry System - Report
Produced: 01/17/2026 6:51 AM
Question 20230008
Inquiry Details
References:
2023 SEER Manual. Appendix C: Breast Surgery Codes
Question:
SEER Manual/Surgery of Primary Site 2023--Breast: What instructions should be followed when the 2023 SEER Manual Appendix C 2023 Breast Surgery Codes advise to code 1 in Surgical Procedure of Other Site for a simple bilateral mastectomy but the 2023 STORE Manual does not. See Discussion.
Discussion:
The 2023 SEER Manual, Appendix C 2023 Breast Surgery Codes, note reads:
SEER Note: Assign code A760 for a more extensive bilateral mastectomy. Assign code 0 in Surgical Procedure of Other Site (NAACCR #1294). For a simple bilateral mastectomy, assign code A410 with code 1 in Surgical Procedure of Other Site (NAACCR #1294).
In the 2023 STORE Manual, these notes are not mentioned and we are instructed not to code surgery to other site. Other education related to 2023 breast coding provided by NAACCR states to not code surgery to other site.
Answer:
Assign code 1 in Surgical Procedure of Other Site (NAACCR #1294) when a simple bilateral mastectomy is performed for a single tumor involving both breasts. This statement was inadvertently omitted from the STORE manual and will be added back in: For single primaries only, code removal of contralateral breast under the data item Surgical Procedure/Other Site (NAACCR Item #1294) or Surgical Procedure/Other Site at This Facility (NAACCR Item #674).
The information presented by NAACCR was intended to be consistent with what is in the SEER manual. It may have been misuderstood.
