CPT code 0509T covers pattern electroretinography (PERG), a diagnostic electrophysiologic procedure that measures retinal and macular function. PERG is used in ophthalmology to assess retinal ganglion cell and macular responses, informing diagnosis and monitoring of retinal and neuro-ophthalmic conditions. Nationally, accurate coding for PERG matters for clinical documentation, reimbursement consistency, and aggregation of utilization data across outpatient eye care settings.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication offers readers national benchmarks for coding and utilization where available, summarizes relevant policy and coverage themes, and provides clinical context about the test's role in retinal and macular assessment. The analysis highlights typical sites of service and what the code represents clinically, helping billing staff, practice managers, and policy analysts understand how PERG procedures are captured in claims data.

Readers will find a concise explanation of the procedure and its clinical applications, a summary of payer coverage landscape, and references to common billing elements and reporting practices. Data not available in the input will be noted where applicable.