ICD-10-CM > C00-D49 > C50-C50 > C50 > C50.2 > C50.21 C50.21 Malignant neoplasm of upper-inner quadrant of breast, female Non-Billable/Non-Specific Codes C50.211Malignant neoplasm of upper-inner quadrant of right female breastC50.212Malignant neoplasm of upper-inner quadrant of left female breastC50.219Malignant neoplasm of upper-inner quadrant of unspecified female breast