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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Skin And Subcutaneous Tissue 680-709 > Other Inflammatory Conditions Of Skin And Subcutaneous Tissue 690-698 > Lichen 697.* > 2007 ICD-9-CM Diagnosis 697.0 Lichen planus  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 697.0 can be accessed here. 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. 697.0 is a specific code that can be used to specify a diagnosis 697.0 contains 5 index entries View the ICD-9-CM Volume 1 697.* hierarchy 697.0 also known as: Lichen: planopilaris ruber planus Index entries containing 697.0: Lichen 697.9 planopilaris 697.0 planus (acute) (chronicus) (hypertrophic) (verrucous) 697.0 morphoeicus 701.0 sclerosus (et atrophicus) 701.0 ruber 696.4 of Wilson 697.0 planus 697.0 Wilson's lichen ruber 697.0