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SEER Inquiry System - Report
Produced: 04/03/2026 4:11 PM
Question 20180103
Inquiry Details
References:
#1: 2014+ Grade Instructions
#2: WHO Class Digest System Tumors
Question:
Histology/Grade--Small intestine: For a 2017 diagnosis, is the grade/differentiation field coded 1 or 9 when the diagnosis is well-differentiated neuroendocrine tumor (NET) (carcinoid)? It seems as though the term well-differentiated defines type of neuroendocrine tumor so they can diagnosis the carcinoid. See Discussion.
Discussion:
5/15/17 Duodenal bulb, biopsy: Fragments of duodenal mucosa with well differentiated neuroendocrine tumor (carcinoid), extending to the edge of specimen and peptic duodenitis in the submitted tissue. No significant intraepithelial lymphocytosis.
Answer:
Assign grade code 1 for well-differentiated NET (8240/3). Well-differentiated is synonymous with NET, grade 1, according to WHO Classification of Tumors of the Digestive System.
