J21
⚠ Non-billable
Acute bronchiolitis
ICD-10-CM · FY2026 · Diseases of the Respiratory System
Code
J21
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Diseases of the Respiratory System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Includes
- acute bronchiolitis with bronchospasm
Excludes2 — not included here, but may code together
- respiratory bronchiolitis interstitial lung disease (J84.115)
Frequently asked questions
What is ICD-10 code J21?
ICD-10-CM code J21 represents Acute bronchiolitis. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Respiratory System chapter, effective October 1, 2025 – September 30, 2026.
Is J21 billable?
No. J21 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is J21 in?
J21 belongs to the Diseases of the Respiratory System chapter (J00–J99) of ICD-10-CM.
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