Chapter XII

Diseases of the skin and subcutaneous tissue
(L00-L99)

Urticaria and erythema
(L50-L54)


Excludes:	Lyme disease ( A69.2 ) rosacea ( L71.- )


L50		Urticaria
		Excludes:	allergic contact dermatitis ( L23.- ) angioneurotic oedema ( T78.3 ) hereditary angio-oedema ( E84.1 ) Quincke's oedema ( T78.3 ) urticaria: · giant ( T78.3 ) · neonatorum ( P83.8 ) · papulosa ( L28.2 ) · pigmentosa ( Q82.2 ) · serum ( T80.6 ) · solar ( L56.3 )
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
		Urticaria: · chronic · recurrent periodic
L50.9		Urticaria, unspecified


L51		Erythema multiforme
L51.0		Nonbullous erythema multiforme
L51.1		Bullous erythema multiforme
		Stevens-Johnson syndrome
L51.2		Toxic epidermal necrolysis [Lyell]
L51.8		Other erythema multiforme
L51.9		Erythema multiforme, unspecified


L52		Erythema nodosum


L53		Other erythematous conditions
		Excludes:	erythema: · ab igne ( L59.0 ) · due to external agents in contact with skin ( L23-L25 ) · intertrigo ( L30.4 )
L53.0		Toxic erythema
		Use additional external cause code (Chapter XX), if desired, to identify external agent.
		Excludes:	neonatal erythema toxicum ( P83.1 )
L53.1		Erythema annulare centrifugum
L53.2		Erythema marginatum
L53.3		Other chronic figurate erythema
L53.8		Other specified erythematous conditions
L53.9		Erythematous condition, unspecified
		Erythema NOS Erythroderma NOS


L54*		Erythema in diseases classified elsewhere
L54.0*		Erythema marginatum in acute rheumatic fever ( I00+ )
L54.8*		Erythema in other diseases classified elsewhere