Lichenoid drug reaction

This code represents an inflammatory skin condition characterized by papules and plaques resembling lichen planus, which is triggered by a systemic medication. The reaction can manifest with pruritus, violaceous lesions, and may involve mucous membranes.

Use this code when documentation clearly indicates a lichenoid eruption directly attributed to an adverse drug effect. This diagnosis requires a causal link established between medication intake and the onset of the skin reaction.

• Ensure the medical record explicitly states a drug as the causative agent for the lichenoid reaction.
• Consider an additional code for the specific adverse effect of the drug (e.g., T36-T50 with a fifth or sixth character indicating adverse effect).
• Do not confuse with idiopathic lichen planus (L43.0, L43.1, etc.) or other drug-induced skin eruptions that are not lichenoid in nature.