- C: Cancer Psychological therapy service
- C: Cancer services
- C: Cardiac rehabilitation
- C: Cardiology
- C: Cardioversion
- C: Care of the elderly
- C: Caring for children in an emergency
- C: Chaplaincy and pastoral care
- C: Children's Diabetes Service
- C: Children's Services
- C: Chronic obstructive pulmonary disease (COPD)
- C: Cognitive disorders clinic
- C: Colposcopy
- C: Community Orthopaedic Project in Essex (COPE)
- C: Complaints
- C: Complementary Therapy service
- C: Critical care
- C: Macmillan cancer information and support services