Bullous lichen planus

This code represents a rare, chronic inflammatory skin condition characterized by the development of fluid-filled blisters (bullae) on a background of typical lichen planus lesions. These bullae can appear on the trunk, extremities, or mucous membranes, often accompanied by pruritus.

Apply this code when documentation clearly indicates a diagnosis of bullous lichen planus. This diagnosis is typically made based on clinical presentation and confirmed by skin biopsy showing characteristic histopathological features of lichen planus with subepidermal bulla formation.

• Differentiate from other blistering disorders; documentation must specify "bullous" lichen planus.
• Do not confuse with non-bullous forms of lichen planus (e.g., L43.0, L43.2).
• Consider additional codes for associated symptoms like pruritus (L29.x) if documented and treated.