- Cipher Health
- Circa Health
- Citi
- Citizens Who Care
- Citus Health
- CitusHealth
- City of Hope
- City of Hope Medical Center
- ClaimsXten
- Clare Medical
- Clarion Forest VNA
- Clarus
- Claxton-Hepburn Medical Center
- Clayton Dubilier & Rice
- CLC Group
- ClearCare
- Clemac Ltd.
- Cleveland Clinic
- Cleveland Hospice
- Clinical Journal of the American Society of Nephrology