ICD-10 Code B02 – Zoster [herpes zoster] (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B02 – Zoster [herpes zoster]
What it is
B02 identifies herpes zoster, also called shingles. It is the reactivation of varicella-zoster virus, usually causing a painful, localized skin eruption in a nerve distribution.
Clinical signs
Typical findings include unilateral grouped vesicles on an erythematous base, often with burning pain or tingling before the rash appears. Clinical features vary; refer to documentation.
When to use this code
Use B02 when the record documents shingles or herpes zoster as the confirmed diagnosis. Apply it for cases with the classic dermatomal rash, with or without pain, when the provider clearly identifies zoster.
Review the chart for any documented complications or specific sites that may require a more detailed code. If the note only says “rash” or “viral eruption,” check documentation before assigning B02.
Do not use for
Do not use B02 for chickenpox, postherpetic neuralgia alone, or nonspecific skin lesions without a documented zoster diagnosis. Check documentation if the condition is uncertain.
Coding tip
Code the provider’s documented zoster diagnosis first, then look for any specified complications or manifestations that may need additional coding.