Site & Histology Exercise
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Site Code: C23.9
Pathology report indicates gallbladder as primary site.
Histology Code: 8140/32
Pathology report states primary tumor as moderately differentiated adenocarcinoma. Code histologic grade = 2. The peritoneal biopsy shows metastatic poorly differentiated adenocarcinoma. Do not code histologic grade from a metastasis, even though it is a higher grade. Reference: SEER Program Coding and Staging Manual 2004, pg. 92.