Drug photoallergic response

This code signifies an adverse skin reaction to a medication, specifically triggered by exposure to light. It represents a photoallergic dermatitis where the drug acts as a photosensitizer, leading to an immune-mediated response upon UV exposure.

Apply this code when documentation clearly indicates a drug-induced photoallergic reaction, distinct from a phototoxic reaction. This typically involves a delayed, eczematous rash in sun-exposed areas following drug administration and light exposure.

• Differentiate from phototoxic reactions (L56.0), which are dose-dependent and non-immunologic.
• Ensure the causative drug is identified and documented, if known, for potential additional coding.
• This code describes the skin manifestation; consider additional codes for the adverse effect of the drug itself if applicable.