Pancoast's syndrome or tumor

Pancoast's syndrome or tumor is a main term in the FY2027 ICD-10-CM Alphabetic Index (Index to Diseases and Injuries). The Index lists C34.1- for this term: Malignant neoplasm of upper lobe, bronchus or lung. The Index shows it with a dash, which means it is incomplete and needs more characters. Confirm any code you find here in the Tabular List before you report it.