ICD-10 Code B26.82 – Mumps myocarditis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B26.82 – Mumps myocarditis
What it is
B26.82 identifies myocarditis caused by mumps infection. Use it when the record shows inflammation of the heart muscle occurring as a complication of mumps.
Clinical signs
Clinical features vary; refer to documentation. Typical myocarditis may include chest pain, palpitations, shortness of breath, or electrocardiographic changes, but you should code only when the provider links these findings to mumps.
When to use this code
Use B26.82 when the clinician documents mumps myocarditis, mumps with myocarditis, or myocarditis due to mumps. It is appropriate for encounters where the heart involvement is a confirmed complication of the mumps infection. Check documentation if the record only mentions mumps with nonspecific cardiac symptoms.
Do not use for
Do not use this code for myocarditis from another cause, such as viral or autoimmune myocarditis, unless mumps is documented as the cause. Do not assign it for uncomplicated mumps alone.
Coding tip
Code the mumps complication only when the provider clearly documents the causal relationship between mumps and myocarditis.