ICD-10 Code B26.81 – Mumps hepatitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B26.81 – Mumps hepatitis
What it is
B26.81 identifies hepatitis caused by mumps infection. Use it when the record shows liver involvement as a complication of mumps, not just uncomplicated parotitis or a nonspecific viral illness.
Clinical signs
Clinical features vary; refer to documentation. Typical records may note mumps infection with hepatitis, such as jaundice, right upper quadrant discomfort, or abnormal liver findings occurring in the setting of mumps.
When to use this code
Use B26.81 when the provider documents mumps hepatitis, mumps with liver involvement, or hepatitis attributed to mumps. It is appropriate for confirmed cases where hepatitis is part of the diagnosed mumps illness. If the chart only says mumps without hepatic involvement, do not assign this code.
Do not use for
Do not use this code for uncomplicated mumps, viral hepatitis from another cause, or nonspecific elevated liver tests without documented mumps hepatitis. Check documentation if the cause of hepatitis is unclear.
Coding tip
Look for explicit provider linkage between mumps and hepatitis before assigning B26.81.