- AdventHealth
- Adventist Health Tillamook
- Adventist Midwest Health
- Adviise
- Advion
- Advisory Board
- Advocate Aurora Health
- Advocate Health Care
- Aegis Therapies
- Aeris Consulting & Management
- Aetna
- Affinity Living Group
- Affordable Care Act
- Age Friendly Health Systems
- Age Wave
- AgeCare Health Services
- Agemo Holdings
- Agency for Healthcare Research and Quality
- Aging Media Network
- Agnesian HealthCare