Acute bronchiolitis is classified under which ICD-10 category?

Acute bronchiolitis is classified under the ICD-10 category J21. This classification is specific to acute lower respiratory infections that primarily affect the bronchioles, typically seen in infants and young children. The codes within this category encompass various forms of bronchiolitis, which can be caused by different viral infections and may lead to respiratory distress.

The other categories provided in the options pertain to different respiratory conditions. J20 refers to acute bronchitis caused by various infectious agents, J30 addresses allergic rhinitis, and J18 covers pneumonia due to unspecified organisms. Understanding the specific focus of each ICD-10 code helps ensure accurate coding, which is crucial for proper billing and treatment documentation.