AHA Coding Clinic® for ICD-9 - 2010 Issue 3; Ask the Editor

Left Lung Malignancy with Metastasis to Right Lung

A patient with stage IV non-small cell lung cancer of the left lower lobe was admitted with extensive peritoneal metastasis and liver metastasis. CT scan of the lung showed a large tumor in the left lung base with diffuse extension to the right lung. When queried, the provider documented that the tumor had started in the left lung and metastasized to the right lung. Is the presence of cancer in more than one lobe of the lung coded as metastasis or primary cancer of both lungs? What are the correct diagnosis code assignments? ...

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