- Center for Healthcare Information Management
- Centers for Disease Control and Prevention (CDC)
- Centers for Medicare & Medicaid Services (CMS)
- Certification
- Certified Nursing Assistant (CNA)
- Certified Registered Nurse Anesthetist
- Chain of Trust (COT)
- Chain of Trust Agreement
- Civilian Health and Medical Program of the Uniformed Services
- Claim
- Claim Adjustment Reason Codes
- Claim Attachment
- Claim Medicare Remark Codes
- Claim Status Category Codes
- Claim Status Codes
- Clearinghouse
- Clinical Modification (CM)
- Code Set
- Code Set Maintaining Organization
- Code of Federal Regulations (CFR,C.F.R.)
- College of Healthcare Information Management Executives (CHIME)
- Comment
- Community Mental Health Center
- Compliance date
- Comprehensive Inpatient Rehabilitation Facility
- Comprehensive Outpatient Rehabilitation Facility
- Computer-based Patient Record Institute (CPRI)
- Confidentiality
- Congressional Budget Office (CBO)
- Consent and Authorization (Basic Rule)
- Consolidated Omnibus Budget Reconciliation Act (COBRA)
- Consumer Assessment of Health Plans Study (CAHPS)
- Contingency Plan
- Coordination of Benefits (COB)
- Correctional Institution
- Cost-Based Health Maintenance Organization
- Covered Entity (CE)
- Covered Functions
- Covered Information
- Crossover
- Current Dental Terminology (CDT)
- Current Procedural Terminology (CPT)