In simple words: A drug photoallergic response is a skin reaction that occurs when you take certain medications and are exposed to sunlight or other sources of ultraviolet (UV) light. It's a type of allergic reaction where the medication, when activated by UV light, causes an inflammatory response in the skin.

Drug photoallergic response. Use additional code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5). Use additional code to identify the source of the ultraviolet radiation (W89, X32).

Example 1: A patient taking a new antibiotic develops an itchy rash on their face, neck, and hands after spending time outdoors. After ruling out other causes, the physician suspects a drug photoallergic response and advises the patient to limit sun exposure and use sunscreen with high UV protection., A patient on long-term diuretic medication experiences a persistent, itchy rash on their arms and legs during the summer months. Photopatch testing confirms a drug photoallergic reaction. The clinician considers switching the patient's medication to an alternative without photosensitizing effects., An elderly patient using NSAIDs for arthritis develops an eczematous rash on sun-exposed areas. They had no skin issues during the winter months. The physician diagnoses a drug photoallergic response and prescribes a topical corticosteroid cream to relieve the symptoms while considering alternative pain management options.

The documentation should include details about the skin rash (location, appearance, duration), medication history, history of sun exposure, and results of any diagnostic tests (e.g., photopatch test). Additionally, the drug suspected of causing the reaction and the source of the UV radiation should be documented if known.