Exanthema subitum [sixth disease], unspecified

This code represents a common, mild viral illness primarily affecting infants and young children, characterized by a sudden high fever followed by a distinctive rash. It is caused by human herpesvirus 6 (HHV-6) or, less commonly, HHV-7. The rash typically appears as the fever subsides.

Assign this code when documentation confirms a diagnosis of exanthema subitum (roseola infantum or sixth disease) without further specification of complications or manifestations. This code is appropriate when the provider has diagnosed the condition but has not indicated any specific organ involvement or other detailed clinical features.

• Do not use this code if specific manifestations or complications of HHV-6 are documented; instead, refer to more specific codes within B08.2.
• Ensure the documentation clearly states "exanthema subitum," "roseola infantum," or "sixth disease."
• This code is for the acute phase of the illness; it does not apply to sequelae.