ICD-10 Code L21.0 – Seborrhea capitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L21.0 – Seborrhea capitis
What it is
Seborrhea capitis is a scalp condition marked by excess scaling and greasy flaking. It is commonly used for dandruff-like inflammation involving the scalp.
Clinical signs
Typical findings include diffuse scalp scaling, white or yellowish flakes, and mild redness. Clinical features vary; refer to documentation.
When to use this code
Use L21.0 when the provider documents seborrhea capitis, seborrheic dermatitis of the scalp, or a similar scalp-only seborrheic condition. You should code it when the record clearly identifies the scalp as the affected site. Check documentation if the note mentions broader seborrheic dermatitis or another skin disorder.
Do not use for
Do not use this code for nonspecific dry scalp, psoriasis, or tinea capitis unless the provider documents seborrhea capitis. If the diagnosis is unclear, check documentation.
Coding tip
Confirm the anatomic site and exact diagnosis wording before assigning L21.0.