ICD-10 Code L21.8 – Other seborrheic dermatitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L21.8 – Other seborrheic dermatitis
What it is
L21.8 identifies seborrheic dermatitis that does not fit the standard specific categories. Use it for a documented seborrheic dermatitis diagnosis when the record describes another or atypical form.
Clinical signs
Typical findings include erythematous, scaly, greasy-appearing patches in seborrheic areas such as the scalp, face, or chest. Clinical features vary; refer to documentation.
When to use this code
Use L21.8 when the clinician documents seborrheic dermatitis but specifies “other” or an atypical presentation not captured by a more specific code. It may also fit when the site or pattern is recorded clearly, but the note does not support another seborrheic dermatitis code. Check documentation.
Do not use for
Do not use this code for simple dandruff, psoriasis, tinea, or unspecified dermatitis without a documented seborrheic dermatitis diagnosis. If the condition is not clearly described, check documentation.
Coding tip
Code the exact wording in the note and verify that “other” seborrheic dermatitis is explicitly documented before assigning L21.8.