SEER Inquiry System - Question 20100098 Details

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Produced: 01/11/2026 11:41 AM

Question 20100098

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Inquiry Details

References:

#1: WHO Class Hem & Lymph Tumors, 229. 2008

#2: ICD-O-3

Question:

Primary site/Histology--Heme & Lymphoid Neoplasms: How are these fields coded for a 2008 diagnosis of small B cell leukemia, most consistent with mantle cell leukemia that only involved the bone marrow? See Discussion.

Discussion:

A bone marrow biopsy was done on 6/18/2008 and showed only small B cell leukemia, most consistent with mantle cell leukemia. ICD-O-3 does not list a histology code for small B cell leukemia or mantle cell leukemia.

Answer:

Code the histology to 9673/3 [mantle cell lymphoma] and the primary site to C421 [bone marrow].

Mantle cell lymphoma can present in a leukemic phase. The only code available is for mantle cell lymphoma and the only primary site that could be coded would be bone marrow.

Cancer Site Category:

Heme & Lymphoid Neoplasms

Data Item Category:

Histology, Primary site

Other Category:

N/A

Year:

2010