ICD-10 Code L23 – Allergic contact dermatitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L23 – Allergic contact dermatitis
What it is
L23 identifies allergic contact dermatitis, a delayed skin reaction caused by contact with a substance that triggers hypersensitivity. You use it when the record documents an allergic, not irritant, cause.
Clinical signs
Typical findings include localized erythema, pruritus, swelling, and vesicles or scaling at the exposure site. Clinical features vary; refer to documentation.
When to use this code
Use L23 when the clinician documents allergic contact dermatitis and links it to a contact allergen such as metals, fragrances, or topical products. Code the condition even if the exact trigger is not named, as long as the allergic mechanism is clear. If the note only says “rash” or “dermatitis,” check documentation.
Do not use for
Do not use L23 for irritant contact dermatitis, eczema without an allergic cause, or nonspecific skin rash. Check documentation when the cause is unclear.
Coding tip
Look for the words “allergic,” “contact,” or a documented allergen before assigning L23.