| A | B |
| CICU | Cardiac Intensive Care Unit |
| ck | check |
| Cl | chloRIDE or chloRINE |
| cl lq | clear liquids |
| cm | centimeter |
| CMA | certified medical assistant |
| CNP | certified nurse practitioner |
| co c/o | complains of |
| CO2 | carbon dioxide |
| cont | continued |
| COPD | Chronic Obstructive Pulmanary Resuscitation |
| COTA | Certified Occupational Therapy Asst. |
| CPR | CardioPulminary Resuscitation |
| CRTT | Certified Respiratory Therapy Technician |
| CS | Central Supply or Central Service |
| C&S | culture & sensitivity |
| CST | Certified Surgical Technologist |
| CT | computerized tomography |
| CVA | cerebral vascular accident (stroke) |
| Cx | cervix, complication, complaint |
| d | day |
| DA | dental assistant |
| DAT | diet as tolerated |
| DC | Doctor of Chiropractic |
| D/C dc disc | discontinue, discharge |
| DDS | Doctor of Dental Surgery |
| DEA | Drug Enforcement Agency |