ICD-10 Code L13.0 – Dermatitis herpetiformis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L13.0 – Dermatitis herpetiformis
What it is
Use this code for dermatitis herpetiformis, a chronic, intensely itchy blistering skin disorder. It is classically associated with gluten sensitivity and shows grouped vesicles or papules on extensor surfaces.
Clinical signs
Typical findings include pruritic, symmetric eruptions with small vesicles, papules, and excoriations, often on elbows, knees, buttocks, or scalp. Clinical features vary; refer to documentation.
When to use this code
Assign L13.0 when the provider documents dermatitis herpetiformis as the diagnosis, whether confirmed clinically or by biopsy. Use it for visits focused on evaluation, follow-up, or management of this specific condition. Check documentation if the note only mentions rash or pruritus without a clear diagnosis.
Do not use for
Do not use this code for nonspecific dermatitis, eczema, or other blistering rashes without documented dermatitis herpetiformis. If the record does not clearly support the diagnosis, check documentation.
Coding tip
Code the documented diagnosis, not the suspected cause or symptom pattern, unless the provider explicitly states dermatitis herpetiformis.