- ABI Research
- Abode Healthcare
- Above & Beyond Home Health Care and Hospice
- ABS Palliative and Hospice Care
- Absolution Films
- Abt Associates
- Abundant Hospice
- Acadia Hospice
- Acadian Companies
- Acadian Health
- Accent Medical
- AccentCare
- Access Healthcare Physicians
- Acclivity Health
- Acclivity Health Solutions
- Accord Hospice
- Accountable Care Learning Collaborative
- Accreditation Commission for Health Care (ACHC)
- Accredited Home Health
- Accurate Home Care