All ICD10 Codes
Chapter 12

L00–L99: Diseases of the Skin and Subcutaneous Tissue

Diseases of the Skin and Subcutaneous Tissue diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here. Code separately if applicable.)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • lipomelanotic reticulosis (I89.8)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • viral warts (B07.-)
All CodesBillable Only
Internal Codes
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  • L41.4—

    Large plaque parapsoriasis

  • L41.5—

    Retiform parapsoriasis

  • L41.8—

    Other parapsoriasis

  • L41.9—

    Parapsoriasis, unspecified

  • L42—

    Pityriasis rosea

  • L43—

    Lichen planus

  • L43.0—

    Hypertrophic lichen planus

  • L43.1—

    Bullous lichen planus

  • L43.2—

    Lichenoid drug reaction

  • L43.3—

    Subacute (active) lichen planus

  • L43.8—

    Other lichen planus

  • L43.9—

    Lichen planus, unspecified

  • L44—

    Other papulosquamous disorders

  • L44.0—

    Pityriasis rubra pilaris

  • L44.1—

    Lichen nitidus

  • L44.2—

    Lichen striatus

  • L44.3—

    Lichen ruber moniliformis

  • L44.4—

    Infantile papular acrodermatitis [Gianotti-Crosti]

  • L44.8—

    Other specified papulosquamous disorders

  • L44.9—

    Papulosquamous disorder, unspecified

  • L45—

    Papulosquamous disorders in diseases classified elsewhere

  • L49—

    Exfoliation due to erythematous conditions according to extent of body surface involved

  • L49.0—

    Exfoliation due to erythematous condition involving less than 10 percent of body surface

  • L49.1—

    Exfoliation due to erythematous condition involving 10-19 percent of body surface

  • L49.2—

    Exfoliation due to erythematous condition involving 20-29 percent of body surface

  • L49.3—

    Exfoliation due to erythematous condition involving 30-39 percent of body surface

  • L49.4—

    Exfoliation due to erythematous condition involving 40-49 percent of body surface

  • L49.5—

    Exfoliation due to erythematous condition involving 50-59 percent of body surface

  • L49.6—

    Exfoliation due to erythematous condition involving 60-69 percent of body surface

  • L49.7—

    Exfoliation due to erythematous condition involving 70-79 percent of body surface

  • L49.8—

    Exfoliation due to erythematous condition involving 80-89 percent of body surface

  • L49.9—

    Exfoliation due to erythematous condition involving 90 or more percent of body surface

  • L50—

    Urticaria

  • L50.0—

    Allergic urticaria

  • L50.1—

    Idiopathic urticaria

  • L50.2—

    Urticaria due to cold and heat

  • L50.3—

    Dermatographic urticaria

  • L50.4—

    Vibratory urticaria

  • L50.5—

    Cholinergic urticaria

  • L50.6—

    Contact urticaria

  • L50.8—

    Other urticaria

  • L50.9—

    Urticaria, unspecified

  • L51—

    Erythema multiforme

  • L51.0—

    Nonbullous erythema multiforme

  • L51.1—

    Stevens-Johnson syndrome

  • L51.2—

    Toxic epidermal necrolysis [Lyell]

  • L51.3—

    Stevens-Johnson syndrome-toxic epidermal necrolysis overlap syndrome

  • L51.8—

    Other erythema multiforme

  • L51.9—

    Erythema multiforme, unspecified

  • L52—

    Erythema nodosum

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