Secondary and unsp malignant neoplasm of intra-abd nodes

This code signifies the presence of metastatic cancer within the lymph nodes located inside the abdominal cavity. It indicates that the primary tumor originated elsewhere in the body and has spread to these intra-abdominal lymphatic structures. This diagnosis is typically associated with advanced-stage malignancies.

Use this code when documentation explicitly states secondary or metastatic malignancy affecting intra-abdominal lymph nodes, such as mesenteric, retroperitoneal, or para-aortic nodes. This code is appropriate when the primary site of the malignancy is known but not the focus of the current encounter, or when the primary site is unknown. Supporting documentation includes pathology reports confirming metastatic disease in abdominal lymph nodes or imaging studies demonstrating lymphadenopathy consistent with metastatic spread.

• Always sequence the primary malignancy code first, if known and still active, followed by this code for the secondary site.
• If the primary site is unknown, this code may be sequenced first, followed by a code for unknown primary site (e.g., C80.1).
• Distinguish from primary lymphoma of intra-abdominal lymph nodes, which would be coded with a specific lymphoma code.