Secondary and unspecified malignant neoplasm of intra-abdominal lymph nodes

This code signifies the presence of a malignant tumor in the lymph nodes located within the abdominal cavity, where this tumor originated from a primary cancer elsewhere in the body (secondary) or its origin is not specified. It indicates metastatic disease affecting the intra-abdominal lymphatic system.

Apply this code when documentation confirms metastatic malignancy to intra-abdominal lymph nodes, such as mesenteric, retroperitoneal, or para-aortic nodes. This is appropriate when the primary site is known but not the focus of the current encounter, or when the primary site is unknown.

• Always code the primary malignancy first, if known and actively treated.
• Distinguish carefully between primary lymphoma of intra-abdominal lymph nodes and metastatic carcinoma.
• Ensure documentation specifies "intra-abdominal" and "lymph nodes" to support this specific site.