Erythema infectiosum (fifth disease)

This code represents Erythema Infectiosum, commonly known as Fifth Disease, a mild, contagious viral illness caused by parvovirus B19. It typically presents with a characteristic "slapped cheek" facial rash followed by a lacy, reticular rash on the trunk and extremities. While often asymptomatic or mild, it can cause complications in certain populations.

Use this code when documentation confirms a diagnosis of Fifth Disease based on clinical presentation, such as the classic rash, or laboratory confirmation of parvovirus B19 infection. This code is appropriate for both acute and resolved cases where the diagnosis of Fifth Disease is the primary reason for the encounter or a significant co-morbidity.

• Ensure documentation clearly distinguishes Fifth Disease from other viral exanthems like measles or rubella.
• For pregnant patients, consider additional codes for maternal infectious diseases affecting pregnancy (e.g., V01.89 for exposure to parvovirus B19).
• If complications arise, such as aplastic crisis or hydrops fetalis, sequence the Fifth Disease code first, followed by codes for the specific complications.