Human herpesvirus 7 infection

This code identifies an infection caused by Human Herpesvirus 7 (HHV-7), a betaherpesvirus closely related to HHV-6. HHV-7 infections are often asymptomatic or present with mild, non-specific symptoms, but can sometimes cause roseola infantum, particularly in older children, or contribute to febrile seizures.

Assign this code when documentation explicitly states a confirmed HHV-7 infection. This typically occurs in cases of unexplained fever, rash, or other systemic symptoms where laboratory testing (e.g., PCR, serology) has identified HHV-7 as the causative agent.

• Ensure documentation clearly specifies HHV-7, not other herpesviruses like HHV-6 (B10.81) or HSV (B00.-).
• Code any associated manifestations or complications of the HHV-7 infection, such as roseola (B08.2) or febrile convulsions (R56.00), as additional diagnoses.
• Do not use this code for asymptomatic seropositivity without active infection.