ICD-10 Code C34.91 – Malignant neoplasm of unspecified part of right bronchus or lung (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C34.91 – Malignant neoplasm of unspecified part of right bronchus or lung
What it is
This code identifies a malignant tumor in the right bronchus or right lung when the exact subsite is not documented. Use it when the record confirms cancer in the right side but does not specify a more precise location.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include cough, chest pain, shortness of breath, hemoptysis, or imaging showing a suspicious right-sided pulmonary or bronchial mass.
When to use this code
Use C34.91 when the provider documents primary malignancy of the right bronchus or right lung and no more specific lobe, segment, or bronchus is stated. It also fits when pathology, imaging, or an assessment confirms right-sided lung cancer but the exact site remains unspecified. Check documentation if laterality or primary site is unclear.
Do not use for
Do not use this code for left lung disease, bilateral disease, or metastatic cancer to the lung. Do not use it when a more specific right lung or bronchus site is documented.
Coding tip
Query the provider for the exact right-sided subsite whenever the chart only says “lung cancer” or “bronchus cancer.”