- Krabbe's
- Kraepelin-Morel disease (see also Schizophrenia) 295.9
- Kraft-Weber-Dimitri disease 759.6
- Kraurosis
- Kreotoxism 005.9
- Krukenberg's
- Kufs' disease 330.1
- Kugelberg-Welander disease 335.11
- Kuhnt-Junius degeneration or disease 362.52
- Kulchitsky's cell carcinoma (carcinoid tumor of intestine) 259.2
- Kümmell's disease or spondylitis 721.7
- Kundrat's disease (lymphosarcoma) 200.1
- Kunekune - see Dermatophytosis
- Kunkel syndrome (lupoid hepatitis) 571.49
- Kupffer cell sarcoma (M9124/3) 155.0
- Kuru 046.0
- Kussmaul's
- Kwashiorkor (marasmus type) 260
- Kyasanur Forest disease 065.2
- Kyphoscoliosis, kyphoscoliotic (acquired) (see also Scoliosis) 737.30
- Kyphosis, kyphotic (acquired) (postural) 737.10
- Kyrle's disease (hyperkeratosis follicularis in cutem penetrans) 701.1