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SEER Inquiry System - Report
Produced: 03/20/2026 5:23 AM
Question 20051063
Inquiry Details
References:
2004 SEER Manual, C-383 - C-388
Question:
Discussion:
Example
Chest CT: "Almost complete consolidation of RUL and superior segment of RLL, highly suspicious for malignancy and represents primary bronchogenic carcinoma until proven otherwise. Multiple pulmonary masses bilaterally consistent with metastatic disease."
The physician describes multiple masses throughout RLL and LLL of lung suspicious for met disease, particularly lesion in LLL measuring 2.5 cm. The 2 cm mass in right lung abuts pleura, another mass in RLL measures 2.5 cm, smaller nodules in RLL and another 1 cm lesion abuts the pleura. Bx of a rt supraclavicular LN is positive for met carcinoma c/w lung primary.
Would primary site be coded to RLL because the scan states that the lesions on the right side represent primary bronchogenic carcinoma until proven otherwise and the 2.5 cm lesion in the RLL is the location of the largest tumor on the right? Or should site be coded to right lung, NOS and size to unknown because there is no clear statement as to which lesion on the right represents the primary tumor? If the site is lung, NOS, would CS Extension be coded to 65 to describe the multiple nodules in the RLL?
Answer:
This answer was provided in the context of CSv1 coding guidelines. The response may not be used after your registry database has been converted to CSv2.Based on the information provided:
Code primary site C349 [Lung]. Code laterality 1 [Right]. Code CS Tumor Size 999 [Unknown]. Code CS Extension 65 [Separate tumor nodules, same lobe]. Code CS Mets at Dx 39 [Separate tumor nodule in contralateral lung].
