ICD-10-CM > C00-D49 > C50-C50 > C50 > C50.9 > C50.91 C50.91 Malignant neoplasm of breast of unspecified site, female Non-Billable/Non-Specific Codes C50.911Malignant neoplasm of unspecified site of right female breastC50.912Malignant neoplasm of unspecified site of left female breastC50.919Malignant neoplasm of unspecified site of unspecified female breast