ICD-10 Code B05 – Measles (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B05 – Measles
What it is
B05 identifies measles, a contagious viral infection that affects the respiratory system and then causes a characteristic rash. Use this code for documented measles infection, not for exposure alone.
Clinical signs
Typical findings include fever, cough, coryza, conjunctivitis, and a maculopapular rash. Clinical features vary; refer to documentation, especially if the record notes complications or atypical presentation.
When to use this code
Use B05 when the clinician documents active measles or a confirmed diagnosis in the chart. It also applies when the note clearly describes classic measles findings and supports the diagnosis. If the record only says suspected measles or exposure, check documentation before coding.
Do not use for
Do not use this code for measles exposure, immunization, or history of measles without current infection. Do not assign it when another rash illness is documented instead.
Coding tip
Code the documented measles diagnosis and review the chart for any specified complications or related manifestations.