- CMS
- Centers for Medicare & Medicaid Services
- CNM
- Certified Nurse Midwife
- COB
- Coordination of Benefits
- COBRA
- Consolidated Omnibus Budget Reconciliation Act of 1986
- COC
- Certificate of Coverage
- COMP
- Comprehensive Insurance
- CPT
- Current Procedural Terminology
- CRNA
- Certified Registered Nurse Anesthetist
- CRNP
- Certified Registered Nurse Practitioner