L43.9

Approximate Synonyms

• Lichen planus

Clinical Information

• 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.

Details

• L43.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.

• The 2023 edition of ICD-10-CM L43.9 became effective on October 1, 2022.

• This is the American ICD-10-CM version of L43.9 – other international versions of ICD-10 L43.9 may differ.