Malignant neoplasm of axillary tail of right male breast

This code signifies a primary cancerous tumor originating in the axillary tail (tail of Spence) of the right male breast. This specific location is an extension of the breast tissue into the axilla. The malignancy is confirmed and not a benign growth.

Apply this code when documentation clearly indicates a primary malignant neoplasm located in the axillary tail of the right breast in a male patient. Supporting documentation would include pathology reports confirming malignancy and operative reports or imaging studies specifying the tumor's exact location.

• Ensure the documentation specifies "axillary tail" and not just a general quadrant of the breast.
• Verify the patient's gender is male, as there are separate codes for female breast malignancies.
• Confirm this is a primary malignancy; metastatic disease to this site would be coded differently.