Secondary and unspecified malignant neoplasm of intrathoracic lymph nodes

This code signifies the presence of a metastatic malignant tumor within the lymph nodes located inside the chest cavity. This malignancy originated from a primary cancer site elsewhere in the body and has spread to these intrathoracic lymph nodes.

Assign this code when documentation clearly states metastatic involvement of mediastinal, hilar, or other intrathoracic lymph nodes, and the primary site is known or suspected to be elsewhere. This is appropriate for cases where the intrathoracic lymph node involvement is a secondary manifestation of a primary malignancy.

• Always sequence the primary malignant neoplasm code before this secondary site code.
• Ensure documentation specifies "intrathoracic lymph nodes" or a more specific location within the chest (e.g., mediastinal, hilar) to justify this code.
• Do not use this code for primary lymphoma or Hodgkin's disease affecting intrathoracic lymph nodes; those conditions have specific primary malignancy codes.