ICD-10 Code B08 – Other viral infections characterized by skin and mucous membrane lesions, not elsewhere classified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B08 – Other viral infections characterized by skin and mucous membrane lesions, not elsewhere classified
What it is
B08 is a category for viral infections that cause lesions on the skin or mucous membranes but do not fit a more specific ICD-10 code. Use it when the record identifies a qualifying viral illness without a narrower diagnosis.
Clinical signs
Typical findings may include rash, vesicles, ulcers, or other mucocutaneous lesions linked to a viral infection. Clinical features vary; refer to documentation for the exact organism, site, and pattern described.
When to use this code
Use B08 when the provider documents an unspecified or otherwise unclassified viral infection with skin or mucous membrane involvement. It is appropriate when the chart supports a viral cause but does not name a more specific condition. You should code the documented diagnosis, not a symptom alone.
Do not use for
Do not use B08 for bacterial, fungal, or noninfectious skin lesions. If the record names a specific viral disease with its own code, use that code instead. Check documentation.
Coding tip
Look for the exact viral diagnosis and lesion site in the note before assigning B08.