The leading cause of infant hospitalizations by insurance payer and time period, with percentage of total infant hospitalizations and corresponding 95% confidence intervals, National (Nationwide) Inpatient Sample, 2009–2019. Percentage of total infant hospitalizations for acute bronchiolitis due to respiratory syncytial virus (RSV) was provided for other/unknown insurance in October 2015–December 2019 and it was the second-ranked primary diagnosis.