ICD-10-CM > C00-D49 > C50-C50 > C50 > C50.3 C50.3 Malignant neoplasm of lower-inner quadrant of breast Non-Billable/Non-Specific Codes C50.31Malignant neoplasm of lower-inner quadrant of breast, femaleC50.311Malignant neoplasm of lower-inner quadrant of right female breastC50.312Malignant neoplasm of lower-inner quadrant of left female breastC50.319Malignant neoplasm of lower-inner quadrant of unspecified female breastC50.32Malignant neoplasm of lower-inner quadrant of breast, maleC50.321Malignant 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