CPT® Code 95052

Photo patch tests are specialized diagnostic procedures that combine elements of both patch testing and photo testing to evaluate and diagnose photoallergic contact dermatitis. This condition occurs when the skin reacts to allergens in the presence of sunlight. The procedure involves the application of patches containing specific allergens to the skin, typically on the back, where they are symmetrically placed. Each patch is designed to test for a particular allergen, and the patient is instructed to avoid bathing or activities that may induce sweating for a duration of 48 hours to ensure accurate results. After this initial period, the patches are removed, and a qualified healthcare professional assesses the skin for any allergic reactions, such as redness or inflammation. The findings are documented in a written report that details the presence, absence, or degree of reaction to each allergen. Following this, one side of the back is shielded while the other is exposed to ultraviolet (UV) light, which is crucial for identifying any photoallergic reactions. An initial evaluation occurs approximately 30 minutes after UV exposure, with results recorded for further analysis. The patient returns for a final assessment between 48 to 76 hours later, allowing the physician to provide a comprehensive evaluation of any photoallergic reactions to the tested allergens. This thorough process is essential for accurately diagnosing and managing conditions related to photoallergic contact dermatitis.