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SEER Inquiry System - Report
Produced: 02/05/2026 7:30 PM
Question 20220020
Inquiry Details
References:
WHO Class Endocrine Tumors, 81-85. 4th edition
Question:
Histology--Thyroid: What is the correct histology code for a thyroidectomy with final diagnosis of “Right lower lobe: papillary microcarcinoma, conventional type, 0.8 cm. Isthmus: papillary microcarcinoma, follicular variant, 0.2 cm. Left lobe: Papillary carcinoma, conventional, unencapsulated.” See Discussion.
Discussion:
We were previously told that papillary microcarcinoma is coded to 8260 (papillary thyroid carcinoma) and not papillary microcarcinoma (8341). That is an area of confusion.
Answer:
Based on the information provided, code histology to follicular variant of papillary thyroid carcinoma (8340/3). The tumor is a mix of papillary and follicular variants.
Cancer Site Category:
Thyroid
Data Item Category:
Histology
Other Category:
N/A
Year:
2022
