Urticaria and erythema (L49-L54)

L49Exfoliation 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 syndrome (L00)
› Stevens-Johnson syndrome (L51.1)
› Stevens-Johnson syndrome-toxic epidermal necrolysis
› overlap syndrome (L51.3)
› Toxic epidermal necrolysis (L51.2)

L49.0Exfoliation due to erythematous condition involving less than 10 percent of body surface
› Exfoliation due to erythematous condition NOS

L49.1Exfoliation due to erythematous condition involving 10-19 percent of body surface

L49.2Exfoliation due to erythematous condition involving 20-29 percent of body surface

L49.3Exfoliation due to erythematous condition involving 30-39 percent of body surface

L49.4Exfoliation due to erythematous condition involving 40-49 percent of body surface

L49.5Exfoliation due to erythematous condition involving 50-59 percent of body surface

L49.6Exfoliation due to erythematous condition involving 60-69 percent of body surface

L49.7Exfoliation due to erythematous condition involving 70-79 percent of body surface

L49.8Exfoliation due to erythematous condition involving 80-89 percent of body surface

L49.9Exfoliation due to erythematous condition involving 90 or more percent of body surface

L50Urticaria
Excludes 1: allergic contact dermatitis (L23.-)
› angioneurotic edema (T78.3)
› giant urticaria (T78.3)
› hereditary angio-edema (D84.1)
› Quincke's edema (T78.3)
› serum urticaria (T80.6-)
› solar urticaria (L56.3)
› urticaria neonatorum (P83.8)
› urticaria papulosa (L28.2)
› urticaria pigmentosa (D47.01)

L50.0Allergic urticaria

L50.1Idiopathic urticaria

L50.2Urticaria due to cold and heat
Excludes 2: familial cold urticaria (M04.2)

L50.3Dermatographic urticaria

L50.4Vibratory urticaria

L50.5Cholinergic urticaria

L50.6Contact urticaria

L50.8Other urticaria
› Chronic urticaria
› Recurrent periodic urticaria

L50.9Urticaria, unspecified

L51Erythema multiforme
Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50) with fifth or sixth character 5)
Use Additional Code: code to identify associated manifestations, such as:
› arthropathy associated with dermatological disorders (M14.8-)
› conjunctival edema (H11.42)
› conjunctivitis (H10.22-)
› corneal scars and opacities (H17.-)
› corneal ulcer (H16.0-)
› edema of eyelid (H02.84-)
› inflammation of eyelid (H01.8)
› keratoconjunctivitis sicca (H16.22-)
› mechanical lagophthalmos (H02.22-)
› stomatitis (K12.-)
› symblepharon (H11.23-)
Use Additional Code: code to identify percentage of skin exfoliation (L49.-)
Excludes 1: staphylococcal scalded skin syndrome (L00)
› Ritter's disease (L00)

L51.0Nonbullous erythema multiforme

L51.1Stevens-Johnson syndrome

L51.2Toxic epidermal necrolysis [Lyell]

L51.3Stevens-Johnson syndrome-toxic epidermal necrolysis overlap syndrome
› SJS-TEN overlap syndrome

L51.8Other erythema multiforme

L51.9Erythema multiforme, unspecified
› Erythema iris
› Erythema multiforme major NOS
› Erythema multiforme minor NOS
› Herpes iris

L52Erythema nodosum
Excludes 1: tuberculous erythema nodosum (A18.4)

L53Other erythematous conditions
Excludes 1: erythema ab igne (L59.0)
› erythema due to external agents in contact with skin (L23-L25)
› erythema intertrigo (L30.4)

L53.0Toxic erythema
Code First: poisoning due to drug or toxin, if applicable (T36-T65 with fifth or sixth character 1-4)
Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50) with fifth or sixth character 5)
Excludes 1: neonatal erythema toxicum (P83.1)

L53.1Erythema annulare centrifugum

L53.2Erythema marginatum

L53.3Other chronic figurate erythema

L53.8Other specified erythematous conditions

L53.9Erythematous condition, unspecified
› Erythema NOS
› Erythroderma NOS

L54Erythema in diseases classified elsewhere
Code First: underlying disease.