Scenario: 2021 Mastectomy found to have DCIS in RUOQ & RLOQ, Invasive ductal carcinoma in RUOQ
Question: How would you code primary site?
- C504 UOQ
- C509 Breast NOS
Answer: C504 UOQ
- Breast Solid Tumor Rules Table 1: Primary Site Codes https://seer.cancer.gov/tools/solidtumor/
- Refer to the SEER Manual and COC Manual for a priority list for using documents such as mammograms, operative reports, and pathology reports to determine the tumor location.
- SEER Program Coding and Staging Manual 2021 Appendix C Coding Guidelines Breast https://seer.cancer.gov/manuals/2021/appendixc.html
- Code the subsite with the invasive tumor when the pathology report identifies invasive tumor in one subsite and in situ tumor in a different subsite or subsites.