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SEER Inquiry System - Report
Produced: 07/14/2025 5:40 PM
Question 20021044
Inquiry Details
References:
Question:
Discussion:
Example 1: No pathology specimen is available from the primary site for a lung primary. Rib biopsy demonstrated "anaplastic adenocarcinoma."
Example 2: Lung tissue biopsy revealed "poorly differentiated non-small cell carcinoma" for a lung primary. Pleural effusion cytology was consistent with "adenocarcinoma".
Answer:
For tumors diagnosed prior to 2007:
Example 1: Code the Histology and Grade, Differentiation fields to 8140/39 [adenocarcinoma, NOS, grade not stated]. Because there was no microscopic examination of tissue from the primary site, the histology may be coded from the microscopic examination of the tissue from a metastatic site. Do not code grade from a metastatic site regardless of whether the involvement of the metastatic site is by direct extension or by discontinuous metastases.
Example 2: Code the Histology and Grade, Differentiation fields to 8046/33 [non-small cell carcinoma, poorly differentiated]. Because there is a microscopic examination of tissue from the primary site, that information should be used to code histology rather than a cytology of a metastatic site.
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.
