ICD-10 Code L23.81 – Allergic contact dermatitis due to animal (cat) (dog) dander (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L23.81 – Allergic contact dermatitis due to animal (cat) (dog) dander
What it is
This code identifies allergic contact dermatitis caused by exposure to animal dander, such as from cats or dogs. It reflects a skin reaction triggered by contact with the allergen, not a generalized allergy diagnosis.
Clinical signs
Typical findings include localized itching, redness, rash, and inflamed or irritated skin at the contact site. Clinical features vary; refer to documentation if the record does not clearly link the dermatitis to animal dander.
When to use this code
Use L23.81 when the provider documents allergic contact dermatitis specifically due to cat or dog dander, or animal dander in general. You should also use it when the note clearly ties the dermatitis to confirmed exposure and skin symptoms. Check documentation if the cause is described only as “allergy” without skin involvement.
Do not use for
Do not use this code for simple environmental allergies, asthma, or nonspecific urticaria without dermatitis. It is also not appropriate when the trigger is unknown or another contact allergen is documented.
Coding tip
Look for explicit provider wording that links the dermatitis to animal dander before assigning L23.81.