01/01/22 patient had breast biopsy and axillary lymph node b…

01/01/22 patient had breast biopsy and axillary lymph node biopsy performed and path report revelaed ductal carcinoma, grade 2 and the axillary lymph node was positive for mets. 01/25/2022 Patient presented for mastectomy and path report revealed ductal carcinoma, G3, with 4/13 axillary LNs pos. What is the regional nodes examined code?