ICD-10 Code B08.2 – Exanthema subitum [sixth disease] (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B08.2 – Exanthema subitum [sixth disease]
What it is
B08.2 identifies exanthema subitum, also called roseola or sixth disease. It is a common childhood viral illness marked by a sudden fever followed by a rash as the fever resolves.
Clinical signs
Typical findings include several days of high fever, then a pink maculopapular rash on the trunk that may spread to the neck and limbs. Clinical features vary; refer to documentation.
When to use this code
Use B08.2 when the provider documents roseola, exanthema subitum, or sixth disease as the diagnosis. It is appropriate when the chart clearly describes the classic febrile illness with the characteristic rash and no alternate cause is documented.
Do not use for
Do not use this code for nonspecific viral exanthems, drug eruptions, or rashes without documented roseola. Check documentation if the diagnosis is uncertain or the eruption is attributed to another infection.
Coding tip
Code from the provider’s stated diagnosis, not from rash alone; if roseola is not documented, verify the final assessment.