| CIO | chief information officer |
|---|---|
| CO | carbon monoxide; cardiac output; castor oil; casualty officer; centric occlusion; cervical orthosis;... |
| COO | chief operating officer; cost of ownership [analysis] |
| CORD | Commissioned Officer Residency Deferment; Council of Residency Directors |
| COSTEP | Commissioned Officer Student Training and Extern Program |