| Abbreviation | Definition |
|---|---|
| HYT | HYperTension |
| I | Internal |
| I | Irritant |
| I&D | Incision and Drainage |
| I&O | input and output (fluid) |
| I&O | Intake and Output |
| I/O | Intraosseous |
| I/T | intrathecal |
| I/V | intravenous |
| IA | Impulse Activity |
| IA | Inborn Attributes |
| IA | Incurred Accidentally |
| IA | Intra-Arterial |
| IABP | intra-aortic balloon pulsation |
| IABP | Intra-Aortic Balloon Pump |
| IAC | Internal acoustic canal |
| IAC | Internal Auditory Canal |
| IAC | Interposed Abdominal Compression |
| IAD | Internet Addiction Disorder |
| IAE | Internal And External |