Ultrasound Utilization Among Medicare Beneficiaries From 2009 to 2021 by Billing Specialty and Place of Service.

Patterns of ultrasound utilization in the national Medicare population shifted from 2009 to 2021. Office ultrasound services were increasingly performed by radiologists, whereas hospital outpatient and inpatient services were increasingly performed by cardiologists/cardiac surgeons; ultrasound services in other places of service were increasingly performed by nonphysician practitioners.