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Dermatitis due to substances taken internally==

Code first (T36-T65), to identify drug or substance
Excludes1: allergy NOS (T78.40)
Excludes2: adverse food reaction, except dermatitis (T78.0-T78.1)
contact dermatitis (L23-L25)
drug photoallergic response (L56.1)
drug phototoxic response (L56.0)
urticaria (L50.-)
L27.0 Generalized skin eruption due to drugs and medicaments taken internally
L27.1 Localized skin eruption due to drugs and medicaments taken internally
L27.2 Dermatitis due to ingested food
Excludes2: dermatitis due to food in contact with skin (L23.6, L24.6, L25.4)
L27.8 Dermatitis due to other substances taken internally
L27.9 Dermatitis due to unspecified substance taken internally

L28 Lichen simplex chronicus and prurigo

L28.0 Lichen simplex chronicus
Circumscribed neurodermatitis
Lichen NOS
L28.1 Prurigo nodularis
L28.2 Other prurigo
Prurigo NOS
Prurigo Hebra
Prurigo mitis
Urticaria papulosa

L29 Pruritus

Excludes1: neurotic excoriation (L98.1)
psychogenic pruritus (F45.8)
L29.0 Pruritus ani
L29.1 Pruritus scroti
L29.2 Pruritus vulvae
L29.3 Anogenital pruritus, unspecified
L29.8 Other pruritus
L29.9 Pruritus, unspecified
Itch NOS

L30 Other and unspecified dermatitis

Excludes2: contact dermatitis (L23-L25)
dry skin dermatitis (L85.3)
small plaque parapsoriasis (L41.3)
stasis dermatitis (I83.1-.2)
L30.0 Nummular dermatitis
L30.1 Dyshidrosis [pompholyx]
L30.