| Abbreviation | Definition |
|---|---|
| KR | Korg Rhythm |
| KS | Korean Standard |
| KSS | KearnsSayre Syndrome |
| KSS | Kearns–Sayre Syndrome |
| KT | Kidney Trouble |
| KT | Klippel-Trenaunay syndrome |
| KTM | Kinetic Thermal Mixing |
| KTS | Klippel-Trenaunay Syndrome |
| KTWS | Klippel-Trénaunay-Weber Syndrome |
| KUB | Kidney, Ureter, and Bladder |
| K-WIRE | Kirschner wire |
| KYBO | Keep Your Bowels Open |
| L | Left |
| L | Leftpart |
| L | Life |
| L | Living |
| L | Lumbar |
| L&A | Light And Accommodation |
| L&H | Lungs and heart |
| L&S | Liver and spleen |