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SEER Inquiry System - Report
Produced: 12/27/2025 6:52 PM
Question 20140063
Inquiry Details
References:
2007 MP/H Rules
Question:
MP/H Rules--Histology: How is histology coded when a metastatic site is biopsy positive for adenocarcinoma, but the physician clinically states this is cholangiocarcinoma? See discussion.
Discussion:
The patient underwent a PTA biopsy of a lytic mass showing metastatic adenocarcinoma. Imaging revealed a large hepatic mass consistent with cholangiocarcinoma. The physician's impression on a physical exam note was the PTA biopsy was most consistent with intrahepatic cholangiocarcinoma. However, the PTA pathology report was reviewed at this facility and the final diagnosis was not stated to be cholangiocarcinoma, only adenocarcinoma, NOS.
The priority order for coding histology rules in the MP/H Manual indicates pathology has priority over documentation in the medical record. Following the rules in the MP/H Manual, the histology would be coded as 8140 [Adenocarcinoma, NOS]. While this may be technically correct, it seems that intrahepatic cholangiocarcinoma is often diagnosed as adenocarcinoma on biopsy, but further stated to be cholangiocarcinoma by the physician once other primary sites have been excluded. By applying the rules in the MP/H Manual, cases that seem better characterized as cholangiocarcinomas are being collected as adenocarcinoma, NOS. Should the histology be adenocarcinoma [8140/3] or cholangiocarcinoma [8160/3] for these cases?
Answer:
When the physician has reviewed all of the pertinent information, and the physician's opinion is documented stating that the histology is cholangiocarcinoma, code cholangiocarcinoma.
A pathology report from a primary site has the highest priority for coding histology; however, there is no such pathology report in this case. We will review the histology coding instructions and add clarification in the next version.
