- Adena Health System
- AdventHealth
- Adventist Health
- Adventist Healthcare
- Advocate Aurora Health
- Alameda Health System
- Albany Medical Center
- Alecto Healthcare Services
- Allegheny Health Network
- Allina Health System
- Altru Health System
- Altus Health System
- AMG Integrated Healthcare Management
- AMITA Health System
- Anderson Regional Health System
- AnMed Health System
- Ann and Robert H Lurie Childrens Hospital
- Anne Arundel Health System
- Appalachian Regional Healthcare
- Appalachian Regional Healthcare System
- Archbold Medical Center
- Ardent Health Services
- Arkansas Childrens Hospital
- Armstrong County Memorial Hospital
- Arnot Health
- Arrowhead Regional Medical Center
- Asante Health System
- Ascension Health
- Aspirus
- Astria Health System