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 Pityriasis rosea==

L43 Lichen planus

 * Excludes1: lichen planopilaris (L66.1)
 * L43.0 Hypertrophic lichen planus
 * L43.1 Bullous lichen planus
 * L43.2 Lichenoid drug reaction
 * Code first (T36-T50) to identify drug
 * L43.3 Subacute (active) lichen planus
 * Lichen planus tropicus
 * 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

 * Code first underlying disease.

=Urticaria and erythema (L49-L54)=
 * Excludes1: Lyme disease (A69.2-)
 * rosacea (L71.-)

L49 Exfoliation due to erythematous conditions according to extent of body surface involved

 * Code first erythematous condition causing exfoliation, such as:
 * Ritter's disease (L00)
 * (Staphylococcal) scalded skin syndrom (L00)
 * Stevens-Johnson syndrome (L51.1)
 * Stevens-Johnson syndrome-toxic epidermal necrolysis
 * overlap syndrome (L51.3)
 * Toxic epidermal necrolysis (L51.2)
 * L49.0 Exfoliation due to erythematous condition involving less than 10 percent of body surface
 * Exfoliation due to erythematous condition NOS
 * L49.1 Exfoliation due to erythematous condition involving 10-19 percent of body surface
 * L49.