ICD-10-CM > J00-J99 > J20-J22 > J21 J21 Acute bronchiolitis Non-Billable/Non-Specific Includes acute bronchiolitis with bronchospasm Type 2 Excludes respiratory bronchiolitis interstitial lung disease (J84.115) Codes J21.0Acute bronchiolitis due to respiratory syncytial virusJ21.1Acute bronchiolitis due to human metapneumovirusJ21.8Acute bronchiolitis due to other specified organismsJ21.9Acute bronchiolitis, unspecified