ICD-10-CM > C00-D49 > C50-C50 > C50 > C50.3 > C50.32 C50.32 Malignant neoplasm of lower-inner quadrant of breast, male Non-Billable/Non-Specific Codes C50.321Malignant neoplasm of lower-inner quadrant of right male breastC50.322Malignant neoplasm of lower-inner quadrant of left male breastC50.329Malignant neoplasm of lower-inner quadrant of unspecified male breast