- Leukasmus 270.2
- Leukemia, leukemic (congenital) (M9800/3) 208.9
- Leukemoid reaction (basophilic) (lymphocytic) (monocytic) (myelocytic) (neutrophilic) 288.62
- Leukoaraiosis (hypertensive) 437.1
- Leukoariosis - see Leukoaraiosis
- Leukoclastic vasculitis 446.29
- Leukocoria 360.44
- Leukocythemia - see Leukemia
- Leukocytopenia 288.50
- Leukocytosis 288.60
- Leukoderma 709.09
- Leukodermia (see also Leukoderma) 709.09
- Leukodystrophy (cerebral) (globoid cell) (metachromatic) (progressive) (sudanophilic) 330.0
- Leukoedema, mouth or tongue 528.79
- Leukoencephalitis
- Leukoencephalopathy (see also Encephalitis) 323.9
- Leukoerythroblastosis 289.9
- Leukoerythrosis 289.0
- Leukokeratosis (see also Leukoplakia) 702.8
- Leukokoria 360.44
- Leukokraurosis vulva, vulvae 624.09
- Leukolymphosarcoma (M9850/3) 207.8