ICD-10-CM > C00-D49 > C30-C39 > C34 > C34.3 C34.3 Malignant neoplasm of lower lobe, bronchus or lung Non-Billable/Non-Specific Codes C34.30Malignant neoplasm of lower lobe, unspecified bronchus or lungC34.31Malignant neoplasm of lower lobe, right bronchus or lungC34.32Malignant neoplasm of lower lobe, left bronchus or lung