V.4.2 Mets at Diagnosis – Bone, Brain, Liver, Lung, Distant Lymph Nodes, and Other

The following data items record the specific site(s) of metastatic disease present at diagnosis. Each field identifies whether bone, brain, distant lymph nodes, liver, lung or other discontinuous or distant metastatic site(s) are involved.

Coding Instructions:

• Metastatic involvement may be single (one focus of metastatic disease) or multiple (multiple foci of metastatic disease in the same site or multiple sites). Information may be clinical or pathologic.

• Code these fields for metastasis even if the patient had neoadjuvant (preoperative) systemic therapy, unless it is determined to be disease progression.

• These fields should be coded for all solid tumors, Kaposi’s sarcoma, Lymphoma’s, Unknown primary site and Other and Ill-defined primary sites.

• Code this field for Lymphomas of all sites for the histologies (9590-9699, 9702-9727, 9735, 9737-9738, 9811-9818, 9823, 8927, and 9737). 

• In the data field for each site, enter the code that demonstrates involvement of that site.

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