J21.9
BillableAcute bronchiolitis, unspecified
J21.9 is the ICD-10-CM code for Acute bronchiolitis, unspecified. It is a billable, specific code valid for reimbursement.
J00-J99 Diseases of the respiratory system
What this means — in plain language
MedlinePlus · NIHWhen you breathe in, the air travels down through your trachea (windpipe). It then goes through two tubes to your lungs. These tubes are your bronchi. Bronchial disorders can make it hard for you to breathe. The most common problem with the bronchi is bronchitis, an inflammation of the tubes. It can be acute or chronic . Other problems include: Bronchiectasis - a condition in which damage to the airways causes them…
Read more about Bronchial Disorders at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Includes
- •Bronchiolitis (acute)
Excludes1 — not coded here
- •chronic bronchiolitis (J44.89)
Medications indicated for this condition
FDA labeling- RibavirinNucleoside Analog Antiviral [EPC]›
- NirsevimabRespiratory Syncytial Virus Anti-F Protein Monoclonal Antibody [EPC]›
- PalivizumabRespiratory Syncytial Virus Anti-F Protein Monoclonal Antibody [EPC]›
Drugs whose FDA labeling lists this condition's category among its indications. Informational only — not a treatment recommendation or medical advice.
Frequently asked questions
- What is ICD-10 code J21.9?
- J21.9 is the ICD-10-CM code for "Acute bronchiolitis, unspecified". It falls under J00-J99 Diseases of the respiratory system.
- Is J21.9 a billable code?
- Yes — J21.9 is a billable, specific ICD-10-CM code valid for reimbursement.
- What is excluded from J21.9?
- Excludes1 (not coded here): chronic bronchiolitis (J44.89).
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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