J21: Acute bronchiolitis
Codes under J21 (Acute bronchiolitis). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| J21.0 | Acute bronchiolitis due to respiratory syncytial virus | ✓ |
| J21.0 | Acute bronchiolitis due to respiratory syncytial virus | ✓ |
| J21.1 | Acute bronchiolitis due to human metapneumovirus | ✓ |
| J21.1 | Acute bronchiolitis due to human metapneumovirus | ✓ |
| J21.8 | Acute bronchiolitis due to other specified organisms | ✓ |
| J21.8 | Acute bronchiolitis due to other specified organisms | ✓ |
| J21.9 | Acute bronchiolitis, unspecified | ✓ |
| J21.9 | Acute bronchiolitis, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code J21?
J21 is an ICD-10-CM category covering Acute bronchiolitis. It contains 8 more specific diagnosis codes, 8 of which are billable.
Is J21 a billable code?
No — J21 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example J21.0 — Acute bronchiolitis due to respiratory syncytial virus). 8 of the 8 codes under J21 are billable.
What codes fall under J21?
J21 includes J21.0, J21.0, J21.1, J21.1, J21.8, plus 3 more. See the full list with descriptions and billable status above.
More free billing tools: all ICD-10 categories · ICD-10 search · denial codes · Medicare fees
Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
Code the diagnosis right
Join providers across the country delivering modern virtual care with CareNiva. Free to start, ready in minutes.
100% Satisfaction Guaranteed — try it risk-free