ICD-10 Code B26 – Mumps (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B26 – Mumps
What it is
B26 identifies mumps, a contagious viral infection that typically causes swelling of the salivary glands, especially the parotid glands. Use this code when the record documents mumps infection.
Clinical signs
Common findings include painful swelling of the cheeks or jaw, fever, headache, and malaise. Clinical features vary; refer to documentation for the specific presentation.
When to use this code
Use B26 when the provider documents mumps as the diagnosis, whether confirmed clinically or by testing. It may also apply when the note describes classic parotid swelling with a documented mumps diagnosis. If the chart only says “viral parotitis,” check documentation before assigning B26.
Do not use for
Do not use this code for nonspecific salivary gland swelling without a documented mumps diagnosis. It is also not appropriate for other viral illnesses or bacterial parotitis.
Coding tip
Code B26 only when the record clearly supports mumps; otherwise, query or check documentation.