ICD-10 Code B00 – Herpesviral [herpes simplex] infections (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B00 – Herpesviral [herpes simplex] infections
What it is
B00 identifies infections caused by herpes simplex virus. Use it for herpesviral disease when the record documents HSV infection without a more specific site or complication code.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include grouped vesicles, painful lesions, ulceration, or recurrent outbreaks consistent with herpes simplex infection.
When to use this code
Use B00 when the provider documents herpes simplex infection and no more specific ICD-10-CM code applies. It may fit general HSV infection, recurrent herpes, or unspecified herpesviral disease when the site or complication is not stated.
If the note identifies a specific anatomic site or complication, code that condition instead of the unspecified herpesviral category. Check documentation for whether the episode is oral, genital, ocular, or another manifestation.
Do not use for
Do not use B00 for zoster, varicella, or other non-herpes simplex viral infections. Do not assign it when the record supports a more specific herpes code.
Coding tip
Look for the exact HSV site and manifestation in the chart before defaulting to B00.