ICD-10 Code C34.80 – Malignant neoplasm of overlapping sites of unspecified bronchus and lung (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C34.80 – Malignant neoplasm of overlapping sites of unspecified bronchus and lung
What it is
This code identifies a malignant tumor involving overlapping areas of the bronchus and lung, with the exact site not further specified. Use it when the record confirms cancer in these overlapping respiratory structures.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records describe persistent cough, hemoptysis, chest pain, dyspnea, or imaging showing a suspicious mass involving more than one adjacent bronchopulmonary site.
When to use this code
Use C34.80 when the provider documents a primary malignancy of overlapping sites of the bronchus and lung and does not name a more specific subsite. It is appropriate when pathology, imaging, or operative notes support lung cancer across contiguous areas. If the record specifies a different lobe, bronchus, or laterality detail, code that information instead.
Do not use for
Do not use this code for metastatic disease to the lung or for benign pulmonary nodules. If the documentation names a more specific bronchus or lung site, select that code instead.
Coding tip
Check whether the tumor is primary, overlapping, and unspecific before assigning C34.80.