On the day of first diagnosis, highest respiratory syncytial virus (RSV) (A) and bronchiolitis (B) healthcare encounter rates per 1000 Medicaid live births were observed in the emergency department and outpatient settings, 2016–2018. Denominator: Total number of live births covered by Medicaid in each state. Across the 7 states, 99.7% of the infants with first bronchiolitis or RSV diagnosis had Medicaid coverage, while <0.3% were covered by the Children's Health Insurance Program. RSV and bronchiolitis diagnoses were identified using the International Classification of Diseases, Tenth Revision codes B97.4, J12.1, J20.5, J21.0 for RSV, and RSV codes plus J21.8, J21.9 for bronchiolitis. Abbreviations: AZ, Arizona; CA, California; FL, Florida; MI, Michigan; NC, North Carolina; NY, New York; RSV, respiratory syncytial virus; TX, Texas.