ICD-10-CM > C00-D49 > C50-C50 > C50 > C50.5 > C50.52 C50.52 Malignant neoplasm of lower-outer quadrant of breast, male Non-Billable/Non-Specific Codes C50.521Malignant neoplasm of lower-outer quadrant of right male breastC50.522Malignant neoplasm of lower-outer quadrant of left male breastC50.529Malignant neoplasm of lower-outer quadrant of unspecified male breast