An inflammatory, pruritic disease of the skin and mucous membranes, which can be either generalized or localized. It is characterized by distinctive purplish, flat-topped papules having a predilection for the trunk and flexor surfaces. The lesions may be discrete or coalesce to form plaques. Histologically, there is a "saw-tooth" pattern of epidermal hyperplasia and vacuolar alteration of the basal layer of the epidermis along with an intense upper dermal inflammatory infiltrate composed predominantly of t-cells. Etiology is unknown.
Inflammatory, pruritic disease of the skin and mucous membranes, which can be either generalized or localized; characterized by distinctive purplish, flat-topped papules having a predilection for the trunk and flexor surfaces; lesions may be discrete or coalesce to form plaques.
697 Lichen 
697.0 Lichen planus convert 697.0 to ICD-10-CM