ICD-10 Code C34.10 – Malignant neoplasm of upper lobe, unspecified bronchus or lung (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C34.10 – Malignant neoplasm of upper lobe, unspecified bronchus or lung
What it is
This code identifies a malignant tumor in the upper lobe of the lung when the bronchus or lung site is not further specified. Use it for documented primary lung cancer in that location.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include cough, hemoptysis, chest pain, dyspnea, or an imaging-confirmed upper-lobe mass.
When to use this code
Use this code when the provider documents a malignant neoplasm in the upper lobe and does not specify whether it is in the bronchus or lung. It also fits cases where laterality is not the issue, but the upper-lobe site is the only documented location. Check the record for pathology, imaging, or operative notes supporting the primary site.
Do not use for
Do not use it for metastatic disease to the lung, benign lung lesions, or cancers in a different lobe. If the documentation names a more specific bronchus or lung site, code that instead.
Coding tip
Query for the exact primary site when the note says only “lung cancer” or “upper-lobe mass.”