| LDL | low density lipoproteins |
| LE | Lungenembolie |
| LE | Lupus erythematodes |
| LE | Laryngektomie |
| LED | Lupus erythematodes disseminatus |
| Leu | Leucin |
| Leuko | Leukozyten |
| LEV | Lupus erythematodes viszeralis |
| LFU | lost of follow-up |
| LGA | Large-for-gestational-age |
| LGL | large granular lymphocytes |
| LGL | Lown-Ganong-Levine-Syndrom |
| LGSIL | low-grade squamous intraepithelial lesion |
| LH | Lutenisierendes Hormon |
| LHAD | left heart assist device |
| LHH | Linksherzhypertrophie |
| LHRH | luteinising hormone releasing hormone |
| li. | links |
| LIF | Leukozyten induzierender Faktor |
| LIF | leukemia inhibiting factor |
| Lig | Ligamentum |
| LIMA | linke Arteria mammaria interna |
| LIP | Lymphoide interstitielle Pneumonie |
| Liq | Liquor |
| LITT | Laserinduzierte Thermotherapie |
| Lj | Lebensjahr |
| Ljz | Lebensjahrzehnt |
| LK | Lymphknoten |
| LKG | Lippen-Kiefer-Gaumen (-Spalten) |
| LKM | liver kidney microsomal antibody |