J21

Non-billable

Acute bronchiolitis

J21 is the ICD-10-CM code for Acute bronchiolitis. It is a non-billable category code — use a more specific child code such as J21.0 for billing.

Status
Header (non-billable)
Chapter
J00-J99
Subcodes
4
Edition
FY2026

J00-J99 Diseases of the respiratory system

Includes

  • acute bronchiolitis with bronchospasm

Excludes2 — not included here

  • respiratory bronchiolitis interstitial lung disease (J84.115)

Frequently asked questions

What is ICD-10 code J21?
J21 is the ICD-10-CM code for "Acute bronchiolitis". It falls under J00-J99 Diseases of the respiratory system.
Is J21 a billable code?
No — J21 is a non-billable header code. Use a more specific child code (such as J21.0) for billing.
What are the subcodes of J21?
J21 has 4 more specific child codes, including J21.0, J21.1, J21.8.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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