Malignant carcinoid tumor of the bronchus and lung

This code signifies a malignant neuroendocrine tumor originating in the bronchus or lung, characterized by its carcinoid features. These tumors are typically slow-growing but have the potential to metastasize.

Use this code for confirmed diagnoses of malignant carcinoid tumors specifically located in the bronchial tree or lung parenchyma. Documentation should clearly state the malignancy and the primary site as bronchus or lung, often supported by pathology reports.

• Differentiate from benign carcinoid tumors (D3A.090) or atypical carcinoids, which may have different coding pathways.
• Ensure the pathology report confirms malignancy; "carcinoid tumor" alone may not be sufficient without further specification.
• Code any metastatic sites separately as secondary malignant neoplasms, following the primary code.