- Castell
- Castle Family Health Centers
- Cathedral Square
- Catholic Community Service
- Catholic Community Services
- Catholic Health Association of America
- Catholic Health Initiatives
- Catholic Hospice
- Catholic Hospice Inc.
- Cavalier Healthcare Services
- CB Insights
- CBC Advisors
- CC Young Senior Living
- CD&M Consulting
- CDC Commercial
- Cedar Valley Hospice
- Cedarhurst Senior Living
- Celerian Group
- CellTrak
- Celtic Healthcare