ICD-10-CM > C00-D49 > C50-C50 > C50 > C50.6 C50.6 Malignant neoplasm of axillary tail of breast Non-Billable/Non-Specific Codes C50.61Malignant neoplasm of axillary tail of breast, femaleC50.611Malignant neoplasm of axillary tail of right female breastC50.612Malignant neoplasm of axillary tail of left female breastC50.619Malignant neoplasm of axillary tail of unspecified female breastC50.62Malignant neoplasm of axillary tail of breast, maleC50.621Malignant neoplasm of axillary tail of right male breastC50.622Malignant neoplasm of axillary tail of left male breastC50.629Malignant neoplasm of axillary tail of unspecified male breast