ICD-10 Code C34.0 – Malignant neoplasm of main bronchus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C34.0 – Malignant neoplasm of main bronchus
What it is
C34.0 identifies a malignant tumor arising in the main bronchus, the large airway that connects the trachea to the lungs. Use it when the record specifies the main bronchus as the primary site.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include persistent cough, hemoptysis, wheezing, dyspnea, or recurrent obstructive pneumonia when a central airway lesion is present.
When to use this code
Use C34.0 when the provider documents primary cancer of the main bronchus, or when imaging, bronchoscopy, or pathology clearly localizes the malignancy there. If the site is described only as central lung or hilar, check the record for a more specific bronchial location.
Do not use for
Do not use this code for benign bronchial tumors, metastatic disease to the bronchus, or lung cancers documented in a different lobe or bronchus. Check documentation if the primary site is unclear.
Coding tip
Code the most specific bronchial site documented, and query the provider if the main bronchus is mentioned without clear confirmation of primary malignancy.