ICD-10 Code C34.32 – Malignant neoplasm of lower lobe, left bronchus or lung (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C34.32 – Malignant neoplasm of lower lobe, left bronchus or lung
What it is
C34.32 identifies a malignant tumor arising in the lower lobe of the left lung or left bronchus. Use it when documentation specifies this exact anatomic site.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include persistent cough, hemoptysis, chest pain, dyspnea, or imaging evidence of a left lower lobe or left bronchial mass.
When to use this code
Use this code when the provider documents primary cancer in the lower lobe of the left lung or left bronchus. It also fits pathology, imaging, or operative notes that clearly localize the malignancy to this site. If the record only says “lung cancer,” check documentation.
Do not use for
Do not use it for malignant neoplasms in other lobes, the right lung, or unspecified lung sites. Do not assign it when the lesion is metastatic to the lung unless documentation supports a primary left lower lobe or bronchial tumor.
Coding tip
Code the exact laterality and lobe only when the record states them clearly; otherwise query or use the unspecified site code.