SEER Inquiry System - Question 20041015 Details

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Produced: 10/27/2025 1:46 PM

Question 20041015

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Inquiry Details

References:

#1: ICD-O-3, 26. Rule D

#2: ICD-O-3 Errata & Clarification, 7 of 8. #3, 5/22/2001

Question:

Primary Site--Lymphoma: How should this field be coded when a diffuse large B-cell lymphoma is found in the femur and in the soft tissue of the anterior chest wall but all CT scans are negative for lymphadenopathy?

Discussion:

Answer:

For cases diagnosed prior to 1/1/2010:Code the Primary Site field to C809 [Unknown primary site]. The primary site of diffuse large B cell lymphoma can be either nodal or extranodal. The case described above is likely extranodal because there is no evidence of lymph node involvement. Because the extranodal site of origin is unknown, code the Primary Site to C809.

For cases diagnosed 2010 forward, refer to the Hematopoietic and Lymphoid Neoplasm Case Reportability and Coding Manual and the Hematopoietic Database (Hematopoietic DB) provided by SEER on its website to research your question. If those resources do not adequately address your issue, submit a new question to SINQ.

Cancer Site Category:

Lymphoma

Data Item Category:

Primary site

Other Category:

N/A

Year:

2004