| Coil, Magnetic Resonance, Specialty | Federal registry | 1 |
| Colorimetric Method, Cpk Or Isoenzymes | Federal registry | 1 |
| Colorimetric Method, Gamma-Glutamyl Transpeptidase | Federal registry | 1 |
| Columns | Company website | 1 |
| Combination Compression/Decompression Manual Chest Pump With Impedance Respiratory Valve | Federal registry | 1 |
| Comparison Of Freezing Points & Stds. Of Known Osmotic Pressure, Osmolality | Federal registry | 1 |
| Components, Exercise | Federal registry | 1 |
| Computer, Diagnostic, Pre-Programmed, Single-Function | Federal registry | 1 |
| Computer, Diagnostic, Programmable | Federal registry | 1 |
| Condom | Federal registry | 1 |
| Condom, Synthetic | Federal registry | 1 |
| Confocal Optical Imaging | Federal registry | 1 |
| Congo Red | Federal registry | 1 |
| Connector, Airway (Extension) | Federal registry | 1 |
| Connector, Ureteral Catheter | Federal registry | 1 |
| Container, Sharps | Federal registry | 1 |
| Container, Specimen Mailer And Storage, Temperature Controlled, Sterile | Federal registry | 1 |
| Container, Specimen, Sterile | Federal registry | 1 |
| Continuous Glucose Monitor Informed Insulin Dose Calculator | Federal registry | 1 |
| Continuous Glucose Monitor Retrospective Data Analysis Software | Federal registry | 1 |
| Control, Hematocrit | Federal registry | 1 |
| Control, Plasma, Abnormal | Federal registry | 1 |
| Control, Pump Speed, Cardiopulmonary Bypass | Federal registry | 1 |
| Controls | Company website | 1 |
| Controls For Blood-Gases, (Assayed And Unassayed) | Federal registry | 1 |
| Cord Blood Processing System And Storage Container | Federal registry | 1 |
| Coronary Drug-Eluting Stent | Federal registry | 1 |
| Coronavirus Antigen Detection Test System. | Federal registry | 1 |
| Corrections | Company website | 1 |
| Counter (Beta, Gamma) For Clinical Use | Federal registry | 1 |
| Counter, Differential Cell | Federal registry | 1 |
| Cover, Burr Hole | Federal registry | 1 |
| Cover, Limb | Federal registry | 1 |
| Cover, Mattress (Medical Purposes) | Federal registry | 1 |
| C-Reactive Protein, Antigen, Antiserum, And Control | Federal registry | 1 |
| Crown And Bridge, Temporary, Resin | Federal registry | 1 |
| Crown, Preformed | Federal registry | 1 |
| Cultured Epithelial Autograft | Federal registry | 1 |
| Cultured Human Cell Skin Dressing | Federal registry | 1 |
| Curette, Surgical, General Use | Federal registry | 1 |
| Cushion, Flotation | Federal registry | 1 |
| Cushion, Wheelchair | Federal registry | 1 |
| Cuvette, Thermostated | Federal registry | 1 |
| Cyclosporine | Federal registry | 1 |
| Cytocentrifuge | Federal registry | 1 |
| Data Analytics | Company website | 1 |
| Dc-Defibrillator, Low-Energy, (Including Paddles) | Federal registry | 1 |
| Default Title | Company website | 1 |
| detangling hair brush | Company website | 1 |
| Detector And Alarm, Arrhythmia | Federal registry | 1 |
