Other orthopoxvirus infections

This code identifies an infection caused by an orthopoxvirus other than variola (smallpox) or monkeypox. These infections typically present with vesicular or pustular skin lesions, fever, and lymphadenopathy, and can range in severity. It encompasses rare or unclassified orthopoxvirus infections not specified elsewhere.

Assign this code when documentation confirms an orthopoxvirus infection that is not specifically identified as monkeypox (B04) or smallpox (B03). This may include infections like vaccinia virus complications or other novel orthopoxviruses. Supporting documentation should include laboratory confirmation of an orthopoxvirus and a clear statement ruling out monkeypox or smallpox.

• Do not use this code for confirmed monkeypox (B04) or smallpox (B03).
• Ensure documentation specifies "other orthopoxvirus" or provides sufficient detail to exclude more specific codes.
• Consider an additional code for any associated complications or manifestations, such as encephalitis or pneumonia.