SEER Inquiry System - View

Question: 20130007 Status
Final

References
Source 1:   2007 MP/H Rules
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Notes:  
Source 2:  
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Notes:  


Question
MP/H Rules/Histology--Colon: What rule applies and how is histology coded if a colon tumor is composed of moderately differentiated adenocarcinoma and neuroendocrine tumor, grade 1 (G1)? See Discussion.

Discussion
Intestine, large moderately differentiated adenocarcinoma

Pathological stage: IIIA (T2 N1a Mx) Neuroendocrine tumor, G1

Addendum comment: The results of the immunochemical study are compatible with a neuroendocrine tumor, G1.

Answer
For cases diagnosed 2007 or later, the correct histology code is 8244/3 [composite carcinoid]. The steps used to arrive at this decision are:

Step 1: Open the Multiple Primary and Histology Coding Rules Manual. Choose one of the three formats (i.e., flowchart, matrix or text). Go to the Colon Histology rules because site specific rules have been developed for this primary.

Step 2: Start at the SINGLE TUMOR module, rule H1. The rules are intended to be reviewed in consecutive order within a module. Stop at rule H9. Code the histology as 8244/3 [composite carcinoid] when the diagnosis is adenocarcinoma and carcinoid tumor.

Neuroendocrine tumor, grade 1 (G1) is synonymous with carcinoid tumor [8240/3] for the purpose of rule H9.

History


Last Updated
06/23/2014

Date Finalized
04/29/2013