ICD-10 Code C34.92 – Malignant neoplasm of unspecified part of left bronchus or lung (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C34.92 – Malignant neoplasm of unspecified part of left bronchus or lung
What it is
This code identifies a malignant tumor in the left bronchus or left lung when the exact site is not specified. Use it when documentation confirms left-sided bronchopulmonary cancer but does not name the precise lobe or bronchus.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include cough, dyspnea, chest pain, hemoptysis, or an abnormal imaging result prompting cancer workup.
When to use this code
Use C34.92 when the provider documents primary cancer of the left bronchus or left lung and the record does not identify a more specific subsite. It is appropriate for initial diagnosis, follow-up documentation, or pathology reports that remain nonspecific. If later notes specify a lobe or bronchus, code that more exact site instead.
Do not use for
Do not use this code for right-sided lung cancer, metastatic disease to the lung, or benign pulmonary masses. Check documentation if the record only says “lung cancer” without laterality or site.
Coding tip
Always verify laterality and whether the tumor is primary or secondary before assigning C34.92.