ICD-10 Code B00.1 – Herpesviral vesicular dermatitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B00.1 – Herpesviral vesicular dermatitis
What it is
B00.1 identifies herpes simplex infection of the skin with vesicular dermatitis. Use it when documentation describes herpes-related skin blisters or grouped vesicles, not a nonspecific rash.
Clinical signs
Typical findings include clustered vesicles on an erythematous base, often painful or itchy. Clinical features vary; refer to documentation, especially when the site, recurrence, or herpes type is not clearly stated.
When to use this code
Use B00.1 when the provider documents herpesviral vesicular dermatitis, herpetic vesicles, or a localized cutaneous HSV eruption. It may fit notes describing skin lesions without oral, ocular, or disseminated involvement. Check documentation if the record only says “herpes” or “rash.”
Do not use for
Do not use this code for oral herpes, genital herpes, eczema herpeticum, or unspecified herpes infection. If the documentation does not confirm vesicular dermatitis, check documentation and select a more specific or unspecified code as supported.
Coding tip
Code the condition only when the record links the skin lesions to herpesviral infection; otherwise, query or code the documented diagnosis.