Sec and unsp malig neoplasm of inguinal and lower limb nodes

This code signifies the presence of a metastatic cancerous tumor in the lymph nodes located in the groin (inguinal region) or anywhere in the lower extremities. It indicates that the cancer originated elsewhere in the body and has spread to these specific lymph node sites. The primary malignancy is not located in these lymph nodes.

This code is used when documentation confirms a secondary (metastatic) malignant neoplasm affecting the inguinal or lower limb lymph nodes, and the primary site is either known or unknown. It is appropriate when pathology reports or imaging studies identify metastatic disease in these specific lymph node groups.

• 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 the principal diagnosis if it is the reason for the encounter.
• Distinguish carefully from C77.0 (secondary of head, face, and neck lymph nodes) or C77.2 (secondary of intra-abdominal lymph nodes) based on anatomical location.