ICD-10 Code C34.2 – Malignant neoplasm of middle lobe, bronchus or lung (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C34.2 – Malignant neoplasm of middle lobe, bronchus or lung
What it is
C34.2 identifies a malignant tumor arising in the middle lobe of the right lung or the corresponding bronchus. Use it when documentation specifies this exact anatomic site.
Clinical signs
Clinical features vary; refer to documentation. Common findings in lung cancer include cough, hemoptysis, chest pain, dyspnea, or an imaging report showing a mass in the middle lobe.
When to use this code
Use C34.2 when the provider documents primary cancer of the middle lobe bronchus or lung, or when pathology or imaging clearly localizes the malignancy there. If the record only says “lung cancer” without a site, check documentation before coding.
Do not use for
Do not use this code for metastatic disease to the lung, benign lung lesions, or cancers in another lobe. If the site is unspecified or uncertain, check documentation.
Coding tip
Code the documented primary site exactly; laterality is not part of C34.2, so confirm the middle lobe location before assigning it.