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Produced: 12/29/2025 2:08 AM
Question 20021127
Inquiry Details
References:
ICD-O-3, 29, 32. Rule F, Rule H
Question:
Histology (Pre-2007)/Behavior Code--Thyroid: What code is used to represent the histology "micropapillary carcinoma" of the thyroid? See discussion.
Discussion:
The ICD-O-3 includes "micropapillary intraductal (C50._)" [8507/2], "micropapillary serous (C56.9)" [8460/3] and "micropapillary transitional cell (C67._) [8131/3] but does not seem to include a micropapillary code for a thyroid primary.
Answer:
For tumors diagnosed prior to 2007:
Code the Histology field to 8507/3 [micropapillary carcinoma]. According to rule H, the topography code listed in the ICD-O is disregarded if the tumor is known to arise in another site. In this case, the site is thyroid [C73.9] so the topography code of breast [C50._] can be disregarded for this histology. Apply the matrix principle to change the Behavior Code from 2 to 3.
For tumors diagnosed 2007 or later, refer to the MP/H rules. If there are still questions about how this type of tumor should be coded, submit a new question to SINQ and include the difficulties you are encountering in applying the MP/H rules.
Cancer Site Category:
Thyroid
Data Item Category:
Behavior, Histology
Other Category:
N/A
Year:
2002
