CPT® Code 92275

Deleted

1. Indications

Electroretinography (ERG) is indicated for the diagnosis and evaluation of various conditions affecting the retina. The following are specific indications for performing this procedure:

• Retinal Disorders Conditions such as retinitis pigmentosa, which is characterized by progressive degeneration of the retina, can be assessed using ERG to evaluate the functional status of photoreceptors.
• Macular Degeneration Age-related macular degeneration (AMD) and other forms of macular degeneration can be evaluated to determine the impact on retinal function.
• Inherited Retinal Diseases Genetic conditions that affect retinal function, including congenital stationary night blindness, can be diagnosed through ERG.
• Diabetic Retinopathy ERG can assist in assessing the functional impairment of the retina in patients with diabetes, particularly in the early stages of diabetic retinopathy.
• Retinal Toxicity Evaluation of retinal function in patients who may have experienced toxicity from medications or other substances that can affect retinal health.

2. Procedure

The electroretinography procedure involves several critical steps to ensure accurate measurement of retinal responses. The following outlines the procedural steps:

• Step 1: Pupil Dilation The procedure begins with the instillation of mydriatic drops into the patient's eyes to dilate the pupils. This dilation is essential for allowing sufficient light to enter the eye during testing.
• Step 2: Dark Adaptation After dilation, the patient is required to undergo a dark adaptation period lasting approximately 30 minutes. This period allows the retina to adjust to low light conditions, enhancing its sensitivity to light stimuli.
• Step 3: Electrode Placement Following dark adaptation, electrodes are carefully placed on the surface of the eye. This can involve using contact lens electrodes that rest on the cornea or gold Mylar tape electrodes positioned between the lower eyelid and the sclera or cornea. Dim red illumination is used during this step to minimize interference with the test.
• Step 4: Stabilization To ensure that the patient's head remains still throughout the procedure, head and chin supports are utilized. This stabilization is crucial for obtaining consistent and reliable measurements.
• Step 5: Light Stimulation The retina is stimulated by flashes of light emitted from a bright light source, such as LEDs or a strobe lamp. Alternatively, a full-field dome with its own light source may be employed. The light flashes trigger an electrical response in the retina.
• Step 6: Recording Responses The electrical responses elicited by the light stimuli are captured by the electrodes and recorded. This data is then represented digitally as a waveform for analysis.
• Step 7: Evaluation of Components The recorded responses are evaluated, focusing on two primary components: the a-wave and b-wave. The a-wave reflects the health of the photoreceptors in the outer retina, while the b-wave indicates the health of the inner layers of the retina.
• Step 8: Interpretation and Reporting After the completion of the test, a comprehensive written interpretation of the findings is provided, summarizing the results and any significant observations made during the procedure.

3. Post-Procedure

After the electroretinography procedure, patients may experience temporary visual disturbances due to the dilation of their pupils. It is generally recommended that patients avoid driving or engaging in activities that require clear vision until the effects of the mydriatic drops wear off. The results of the test will be analyzed and documented in a report, which will be shared with the referring physician for further evaluation and management of any identified retinal conditions. Follow-up appointments may be necessary to discuss the findings and any potential treatment options based on the results of the electroretinography.