| Abbreviation | Definition |
|---|---|
| INR | Interval |
| INS | Insulin |
| INS | Insurance |
| INT | Internal |
| IO | Intestinal Obstruction |
| IO | Intraosseous |
| IODR | Intra-Ocular Dexterity Robot |
| IODV | IntraOsseous DiVerticula |
| IOFB | Intraocular foreign body |
| IOL | IntraOcular Lens |
| IONB | Ileal orthotopic Neobladder |
| IOP | Intra-Ocular Pressure |
| IOPD | Infantile Onset Pompe Disease |
| IOTHAL | Iothalamate Sodium |
| IOTHALMEG | Iothalamate Meglumine |
| IOU | Intensive therapy Observation Unit |
| IOXAG | Ioxaglate Sodium |
| IOXAGMEG | Ioxaglate Meglumine |
| IP | InterPhalangeal |
| IP | Interpharangeal |