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Lichen planus

International Classification of Diseases for Mortality and Morbidity Statistics, 11th Revision, v2024-01

Lichen planus is an inflammatory disease of skin and mucous membranes characterised by intense inflammation at the interface between epidermis/epithelium and dermis/corium. Its clinical manifestations vary according to how acutely it develops and to where it attacks. On the skin it typically presents as a symmetrical eruption of itchy, flat-topped pink or purple papules or plaques. Involvement of the scalp or nail matrix can produce permanent loss of hair or nails respectively. Although mucous membrane involvement can be asymptomatic, it can cause significant pain and distress, particularly when it is erosive.

sections/codes in this section (EA91-EA91)

• Acute eruptive lichen planus  (EA91.0)
• Hypertrophic lichen planus  (EA91.1)
• Follicular lichen planus  (EA91.2)
• Lichen planus of genital skin and mucous membranes  (EA91.3)
• Lichen planus and lichenoid reactions of oral mucosa  (EA91.4)
• Lichen planus of the nails  (EA91.5)
• Subacute lichen planus  (EA91.6)
• Other specified lichen planus  (EA91.Y)
• Lichen planus of unspecified type  (EA91.Z)

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