ICD-10 Code B05.2 – Measles complicated by pneumonia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B05.2 – Measles complicated by pneumonia
What it is
B05.2 identifies measles when pneumonia is documented as a complication. Use it for a confirmed measles infection with lower respiratory involvement, not for measles alone.
Clinical signs
Typical measles findings include fever, cough, coryza, conjunctivitis, and a rash. Pneumonia may be documented by respiratory distress, abnormal lung findings, or imaging; clinical features vary, refer to documentation.
When to use this code
Use this code when the provider documents measles with pneumonia, or states that pneumonia is due to measles. It is appropriate when the chart clearly links the respiratory complication to the measles infection. If the record only says measles with respiratory symptoms, check documentation.
Do not use for
Do not use B05.2 for measles without pneumonia, or for pneumonia from another cause. Do not apply it when the record does not support a measles diagnosis; check documentation.
Coding tip
Look for explicit provider linkage between measles and pneumonia before assigning B05.2.