ICD-10 Code L20 – Atopic dermatitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L20 – Atopic dermatitis
What it is
L20 identifies atopic dermatitis, a chronic inflammatory skin condition that causes recurrent eczema. It is used when the record documents atopic dermatitis without a more specific subtype.
Clinical signs
Typical findings include itchy, dry, inflamed skin with recurring eczematous patches or plaques. Clinical features vary; refer to documentation.
When to use this code
Use L20 when the provider documents atopic dermatitis, eczema of atopic origin, or a flare of this condition. Apply the code when the diagnosis is confirmed in the note and no more specific ICD-10-CM option is recorded. Check documentation if the chart only says “rash” or “dermatitis.”
Do not use for
Do not use L20 for contact dermatitis, seborrheic dermatitis, or unspecified rash without documentation of atopic dermatitis. Check documentation when the cause or type of dermatitis is unclear.
Coding tip
Code the most specific documented subtype of atopic dermatitis, and verify whether the note identifies an acute flare, chronic disease, or another dermatitis type.