CPT code 87540 is a molecular diagnostic laboratory test that uses a direct nucleic acid probe to detect Legionella pneumophila. The test is clinically important because L. pneumophila is a cause of Legionnaires’ disease and can be transmitted through contaminated water and HVAC systems, making rapid and specific detection essential for clinical diagnosis and outbreak control. Nationally, laboratory-based detection of Legionella supports both patient management and public health response.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical context for CPT code 87540, typical sites of service, and the service type. The publication summarizes payer coverage considerations, common reimbursement modifiers, and where to find related billing guidance. It also provides benchmarks and policy updates relevant to molecular testing for respiratory pathogens when available.

This summary is intended to inform laboratory billing staff, coding professionals, laboratory directors, and health policy stakeholders about the clinical use and billing classification of CPT code 87540, and to direct readers to the specific sections covering coverage, coding notes, and related resources.