Malignant neoplasm of axillary tail of female breast

This code signifies a primary cancerous tumor originating in the axillary tail (or tail of Spence) of a female patient's breast. This specific anatomical location is a projection of breast tissue extending towards the axilla.

Apply this code when documentation clearly states a malignant neoplasm located in the axillary tail of the female breast. This diagnosis is typically confirmed by biopsy and pathology reports.

• Ensure the documentation specifies "axillary tail" and not just a general quadrant of the breast.
• This code is for the primary malignancy; use secondary codes for metastatic sites.
• Confirm the patient's gender is female, as this code is specific to the female breast.