Malignant neoplasm of left main bronchus

This code signifies a primary cancerous tumor originating in the main bronchus of the left lung. This is a specific type of lung cancer, distinct from tumors in other bronchial segments or lobes.

Assign this code when documentation clearly specifies a primary malignant neoplasm located in the left main bronchus. This typically applies to diagnoses confirmed by biopsy or imaging, indicating the primary site of the malignancy.

• Ensure the laterality (left) and specific bronchial location (main bronchus) are explicitly documented.
• Do not use for secondary (metastatic) malignancies to the bronchus; use appropriate secondary neoplasm codes.
• Code also any associated lung cancer type (e.g., small cell, adenocarcinoma) using an additional code from categories C34.1-C34.9.