Bronchiolitis

Children and teens, Infections.

How common is Bronchiolitis in the US?

Prevalence of RSV bronchiolitis among all pediatric hospital discharges of infants aged 1-24 months, 2019: 180.1 cases per 1000 discharges (All pediatric discharges, infants aged 1-24 months (Kids' Inpatient Database), 2019; United States (nationally representative Kids' Inpatient Database), 2019 (trend period 1997-2019)). Source: Cureus, 2024. Label: REPORTED.

• 180.1 cases per 1000 discharges Prevalence of RSV bronchiolitis among all pediatric hospital discharges of infants aged 1-24 months, 2019. Out of: All pediatric discharges, infants aged 1-24 months (Kids' Inpatient Database), 2019. Where: United States (nationally representative Kids' Inpatient Database). When: 2019 (trend period 1997-2019). RSV-diagnosed bronchiolitis hospitalizations only (excludes non-RSV bronchiolitis and neonates under 1 month); rate is per 1000 all-cause pediatric discharges, not per infant population. Label: REPORTED.

  The prevalence of RSV among all discharges has significantly increased over the study period, rising from 51.6 cases per 1000 discharges in 1997 to 180.1 cases per 1000 discharges in 2019 (p<0.001).

  Source: Epidemiology, Outcomes, and Trend Analysis of Hospitalized Infants With Respiratory Syncytial Virus (RSV) Bronchiolitis From 1997 to 2019 Cureus, 2024. PubMed 39130907. DOI 10.7759/cureus.64229.

Each figure measures something different. Do not compare them with each other or with other conditions.

Medical codes

• ICD-10-CM FY2026: J21.9 Acute bronchiolitis, unspecified (narrower). Other codes in this category also apply.
• ICD-10-CM FY2026: J21.0 Acute bronchiolitis due to respiratory syncytial virus (narrower)

Research activity

As of 2026-09-24: 1,113 registered studies on ClinicalTrials.gov (search Bronchiolitis) and 3,020 PubMed records, 2021 to 2025. A count of records is not how common or serious the condition is.

Population information, not medical advice. Methodology · Known limitations