| 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 |
| L53 | Other erythematous conditions |
| L53.0 | Toxic erythema |
| 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 |
| L54 | Erythema in diseases classified elsewhere |