ICD-10 Code B08.22 – Exanthema subitum [sixth disease] due to human herpesvirus 7 (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B08.22 – Exanthema subitum [sixth disease] due to human herpesvirus 7
What it is
B08.22 identifies exanthema subitum, also called sixth disease, when documentation specifies human herpesvirus 7 as the cause. Use it for this viral childhood illness, not for nonspecific fever or rash alone.
Clinical signs
Typical features include a sudden febrile illness followed by a rash as fever resolves. Clinical features vary; refer to documentation for the confirmed viral cause and any associated findings.
When to use this code
Use this code when the provider documents sixth disease or roseola specifically linked to human herpesvirus 7. It also fits when the record clearly states HHV-7 as the etiologic agent. If the cause is not specified, check documentation before coding.
Do not use for
Do not use B08.22 for exanthema subitum due to another virus or for an unspecified viral exanthem. Do not assign it when the chart only says fever and rash without a confirmed diagnosis.
Coding tip
Code the documented cause exactly; if HHV-7 is not named, verify whether a different exanthem code is more appropriate.