EA91.4

ICD-11 MMS 2026-01

Lichen planus and lichenoid reactions of oral mucosa

Description

Oral lichenoid reactions represent a common end point in response to extrinsic agents (drugs, allergens), altered self-antigens, or superantigens. Clinical presentation can vary from asymptomatic white reticular striae to painful erythema and erosions. Cutaneous and mucosal involvement of other sites is common. Although oral lichen planus is by definition idiopathic, oral lichenoid reactions may be caused by medications or exogenous agents such as cinnamates and other flavourings.

Index terms

  • Lichen planus and lichenoid reactions of oral mucosa

Exclusions from above levels

  • 1B72.0 – Bullous impetigo of the napkin area
  • 1F23.12 – Napkin candidosis
  • EH71 – Dermatoses precipitated by drug therapy
Show allHide
  • EH76 – Dermatoses associated with specific classes of medication

Child codes

  • EA91.40 – Non-erosive lichen planus of oral mucosa
  • EA91.41 – Erosive oral lichen planus
  • EA91.42 – Oral lichen planus, unspecified
  • EA91.43 – Lichenoid mucositis
  • EA91.4Y – Other specified lichenoid reactions of oral mucosa

Sibling codes

  • EA91.0 – Acute eruptive lichen planus
  • EA91.1 – Hypertrophic lichen planus
  • EA91.2 – Follicular lichen planus
  • EA91.3 – Lichen planus of genital skin and mucous membranes
  • EA91.5 – Lichen planus of the nails
  • EA91.6 – Subacute lichen planus
  • EA91.Y – Other specified lichen planus
  • EA91.Z – Lichen planus of unspecified type

Foundation entity

Lichen planus and lichenoid reactions of oral mucosa – http://id.who.int/icd/entity/561406981

Part of: EA91: Lichen planus › 14: Diseases of the skin