- Cone Health
- Confluence Health
- Connecticut Children's Health System
- Connecticut Department of Mental Health & Addiction Services
- Contra Costa Health Services
- Conway Medical Center
- Conway Regional Health System
- Cook Childrens Health Care System
- Cook County Health and Hospital System
- Cookeville Regional Health System
- Cooper University Health
- Corewell Health South
- Cornerstone Healthcare Group
- Cottage Health System
- Covenant Health
- Covenant Health
- Covenant HealthCare
- Covenant Health Systems
- Cox Health
- Crestwood Behavioral Health
- Critical Access Healthcare
- Crouse Hospital Health System
- Crozer Health
- Dartmouth Health
- Davis Health System
- Day Kimball Healthcare
- Dayton Childrens
- DCH Health System
- Deaconess Health System
- DECH and CCH