Emergency: 119
AMDA-IMIC

J21 Acute bronchiolitis

Category / Non-billable header 4 subcodes

Block: Other acute lower respiratory infections (J20-J22)

Includes

  • acute bronchiolitis with bronchospasm

Excludes 2 (not included here)

  • respiratory bronchiolitis interstitial lung disease (J84.115)

Subcodes

Each subcode links to a detail page with full clinical annotations.

Code Description Billable
J21..0 Acute bronchiolitis due to respiratory syncytial virus Yes
J21..1 Acute bronchiolitis due to human metapneumovirus Yes
J21..8 Acute bronchiolitis due to other specified organisms Yes
J21..9 Acute bronchiolitis, unspecified Yes

Plain-language term for this code

The following entry in the US Medical Glossary corresponds to ICD-10-CM category J21:

Last reviewed: September 2026