- 4C Health
- Abbeville Area Medical Center
- Abbeville General Hospital
- Abbott Northwestern Hospital
- Abrazo Arizona Heart Hospital
- Abrazo Arrowhead Campus
- Abrazo Cave Creek Hospital
- Abrazo Central Campus
- Abrazo Health Rehabilitation
- Abrazo Scottsdale Campus
- Abrazo Surprise Hospital
- Abrazo West Campus
- Acacia House Mental Health Center
- Acadiana Rehabilitation Hospital
- Acadian Medical Center
- Acadia - St Landry Hospital
- Acadia Vermilion Hospital - South Campus
- Access Hospital Dayton
- Accord Rehabilitation Hospital
- Acute Rehabilitation Hospital of Plano
- Adair County Memorial Hospital
- Adams County Regional Medical Center
- Adams Memorial Hospital
- AdCare Hospital of Worcester
- Addison Gilbert Hospital
- Adena Fayette Medical Center
- Adena Greenfield Medical Center
- Adena Pike Medical Center
- Adena Regional Medical Center
- Adirondack Medical Center - Saranac Lake