CPT code 78609 represents a PET (positron emission tomography) scan of the brain, a diagnostic nuclear imaging test that assesses brain function and cerebral blood flow. As an advanced functional imaging modality, PET brain scans are important for evaluation of neurodegenerative disorders, seizure focus localization, and certain cerebrovascular and oncologic indications. Nationally, PET brain imaging influences diagnostic pathways, care planning, and utilization of specialty imaging resources.

Key payers covered in this overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise briefing on the clinical context of PET brain imaging, the typical service and site of care, and how this service is addressed across major payers. The publication also summarizes available benchmarks and payer policy themes, where present, and highlights areas where policy updates or utilization considerations may affect access and billing practices.

This summary is intended for clinical managers, coding and billing staff, and policy analysts seeking a national perspective on CPT code 78609, including clinical relevance, payer coverage context, and topics to consider when managing PET brain imaging services.