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J21.0 — Acute bronchiolitis due to respiratory syncytial virus
J21.0
What this code means
Acute bronchiolitis caused by respiratory syncytial virus (RSV), mainly affecting babies and toddlers, with wheezing and feeding difficulty.
Also called: rsv bronchiolitis, bronchiolitis.
When this code is used
Used for acute bronchiolitis due to respiratory syncytial virus.
Where it sits in ICD-10-CM
Code J21.0 belongs to Chapter 10: Diseases of the respiratory system, which covers codes J00–J99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Related symptoms
Watch: related videos
Frequently asked questions
What is ICD-10-CM code J21.0?
J21.0 is the ICD-10-CM diagnosis code for “Acute bronchiolitis due to respiratory syncytial virus”. Acute bronchiolitis caused by respiratory syncytial virus (RSV), mainly affecting babies and toddlers, with wheezing and feeding difficulty.
When is code J21.0 used?
Used for acute bronchiolitis due to respiratory syncytial virus. It belongs to Chapter 10 of ICD-10-CM (Diseases of the respiratory system).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.