Secondary and unspecified malignant neoplasm of lymph nodes of inguinal region and lower limb

This code signifies the presence of a malignant tumor that has spread to the lymph nodes located in the groin (inguinal region) or anywhere in the lower extremities. This malignancy originated elsewhere in the body and metastasized to these specific lymph nodes.

Use this code when documentation clearly indicates metastatic cancer affecting the inguinal or lower limb lymph nodes. This applies when the primary site of the cancer is known but the lymph node involvement is secondary, or when the primary site is unknown but the malignancy is confirmed in these specific lymph nodes.

• Always sequence the primary malignancy code first, if known, followed by this code for the secondary site.
• If the primary site is unknown, this code can be used as a principal diagnosis if it's the reason for the encounter.
• Distinguish from primary lymphoma of these lymph nodes, which would be coded differently.