ICD-10 Code B08.09 – Other orthopoxvirus infections (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B08.09 – Other orthopoxvirus infections
What it is
B08.09 identifies an infection caused by an orthopoxvirus that is not classified elsewhere. Use it for documented orthopoxvirus illness when the record does not specify a more exact diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Orthopoxvirus infections can present with fever, malaise, lymphadenopathy, and a characteristic vesicular or pustular rash, but the exact pattern depends on the virus and case details.
When to use this code
Use this code when the clinician documents an orthopoxvirus infection and does not name a more specific orthopox diagnosis. It also fits cases recorded as other orthopoxvirus infection, unspecified orthopoxvirus infection, or similar wording. Check documentation if the organism is named.
Do not use for
Do not use B08.09 for varicella, herpesvirus infections, or non-orthopox viral exanthems. If the chart specifies monkeypox or another coded orthopox condition, select the documented, more specific code.
Coding tip
Code from the provider’s exact wording; if the orthopoxvirus is named, verify whether a more specific ICD-10-CM option applies.