ICD-10 Code L21.1 – Seborrheic Infantile Dermatitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L21.1 – Seborrheic infantile dermatitis
What it is
L21.1 identifies seborrheic infantile dermatitis, a common inflammatory skin condition in infants. It usually affects the scalp, face, or diaper area and is often called cradle cap when limited to the scalp.
Clinical signs
Typical findings include greasy, yellowish scale, mild redness, and flaky patches on the scalp or other skin folds. Clinical features vary; refer to documentation if the presentation is atypical or extends beyond common infant sites.
When to use this code
Use L21.1 when the clinician documents seborrheic infantile dermatitis, seborrheic dermatitis of infancy, or cradle cap in an infant. Code it when the record supports a seborrheic pattern rather than another rash or infection. Check documentation if the diagnosis is uncertain.
Do not use for
Do not use this code for adult seborrheic dermatitis or for nonspecific dry skin, eczema, or diaper rash without a documented seborrheic diagnosis. If the note does not clearly identify infantile seborrheic dermatitis, check documentation.
Coding tip
Confirm the provider documents the infantile form specifically, because age and site alone do not establish L21.1.