Dr. Jоnes perfоrmed а left breаst biоpsy on the pаtient. The results confirmed a diagnosis of invasive ductal carcinoma, in the lower outer quadrant. This principal diagnosis code is: C50.512 Malignant neoplasm of lower outer quadrant of left female breast C50.522 Malignant neoplasm of lower outer quadrant of left male breast C50.912 Malignant neoplasm of unspecified site of left female breast D05.12 Intraductal carcinoma in situ of left breast D05.91 Unspecified type of carcinoma in situ of right breast D04.5 Carcinoma in situ of skin of trunk (Carcinoma in situ of skin of breast)