Summary & Overview
CPT 0509T: Pattern Electroretinography (PERG) for Retina and Macula
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.
Billing Code Overview
CPT code 0509T describes pattern electroretinography (PERG), an electrophysiologic test that evaluates the functional status of the retina and macula, the light-sensitive tissue at the back of the eye and the area responsible for sharp central vision. The service includes performance of the PERG, interpretation of the recordings, and preparation of a report.
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Service type: Diagnostic electrophysiology procedure
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Typical site of service: Eye clinic, ophthalmology or optometry practice, outpatient specialty diagnostic laboratory
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Clinical & Coding Specifications
Clinical Context
A 62-year-old patient with progressive central vision loss and suspected macular dysfunction is referred to an ophthalmology clinic for electrophysiologic testing. The patient reports decreased visual acuity and difficulty reading despite normal anterior segment exam. The clinic schedules pattern electroretinography (PERG) to assess retinal ganglion cell and macular function. On arrival, a trained ophthalmic technician explains the test, obtains informed consent, and reviews contraindications (e.g., inability to fixate, recent ocular surgery). Topical anesthetic and corneal recording electrodes are placed if required. The provider performs the PERG recording, monitors waveform integrity, and documents test conditions (stimulus pattern, luminance, check size, fixation). The interpreting physician reviews tracings, compares to normative data, documents findings and impressions (for example, reduced P50 amplitude consistent with macular dysfunction or optic nerve disease), and prepares a formal report. The clinic bills 0509T for performance, interpretation, and report generation. Typical site of service is an outpatient ophthalmology or retinal specialty clinic, ambulatory surgical center, or diagnostic testing center. Common clinical indications include macular degeneration, diabetic maculopathy, optic neuropathy surveillance, and unexplained central visual loss.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component |