Secondary malignant neoplasm of right lung

This code signifies the presence of a cancerous tumor in the right lung that originated from a primary cancer elsewhere in the body and subsequently spread to the lung. It indicates metastatic disease to the right lung, not a primary lung cancer.

Apply this code when documentation clearly states metastatic carcinoma to the right lung. This is appropriate when the primary site of the malignancy is known or unknown, but the lung involvement is secondary. Supporting documentation would include pathology reports confirming metastatic disease and imaging studies identifying the right lung as the site of metastasis.

• Always sequence the primary malignancy code first, if known, followed by this code for the secondary site.
• Do not use this code for primary lung cancer; refer to codes in the C34 series for primary lung malignancies.
• Ensure laterality (right lung) is explicitly documented to support the specificity of this code.