ICD-10 Code C34.02 – Malignant neoplasm of left main bronchus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C34.02 – Malignant neoplasm of left main bronchus
What it is
This code identifies a malignant tumor located in the left main bronchus, the large airway that carries air into the left lung. Use it when the documentation specifically names the left main bronchus as the primary site.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings may include persistent cough, hemoptysis, wheezing, dyspnea, or recurrent post-obstructive infection when the airway is involved.
When to use this code
Use C34.02 when the provider documents primary cancer of the left main bronchus, including pathology, imaging, or operative reports that clearly identify that site. You should code it when the bronchus is the documented primary location, not just a general lung mass. If the record only says “lung cancer” or the site is unclear, check documentation before assigning this code.
Do not use for
Do not use this code for metastatic disease to the bronchus or for malignant neoplasms documented in another lung location. Do not assign it when the side or exact bronchial site is not specified.
Coding tip
Verify laterality and the exact bronchial site in the final pathology or provider assessment before coding.