ICD-10-CM
- Kahler's disease
- Kakke
- Kala-azar
- Kallmann's syndrome
- Kartagener's syndrome or triad (sinusitis, bronchiectasis, situs inversus)
- Katayama's disease or fever
- Kawasaki's syndrome
- Kayser-Fleischer ring (cornea) (pseudosclerosis)
- Kaznelson's syndrome (congenital hypoplastic anemia)
- Kearns-Sayre syndrome
- Kedani fever
- Kelis
- Kelly (-Patterson) syndrome (sideropenic dysphagia)
- Keloma
- Kenya fever
- Keratoacanthoma
- Keratomegaly
- Keratoscleritis, tuberculous
- Kerion (celsi)
- Kerunoparalysis
- Keshan disease
- Ketonuria
- Kew Garden fever
- Kinnier Wilson's disease (hepatolenticular degeneration)
- Klatskin's tumor
- Klauder's disease
- Klebsiella (K.) pneumoniae, as cause of disease classified elsewhere
- Klein (e)-Levin syndrome
- Kleptomania
- Klippel's disease
- Klippel-Feil deficiency, disease, or syndrome (brevicollis)
- Klippel-Trenaunay (-Weber) syndrome
- Klumpke (-Déjerine) palsy, paralysis (birth) (newborn)
- Knuckle pad (Garrod's)
- Köebner's syndrome
- Koplik's spots
- Kopp's asthma
- Kraft-Weber-Dimitri disease
- Kreotoxism
- Kufs' disease
- Kugelberg-Welander disease
- Kupffer cell sarcoma
- Kuru
- Kyasanur Forest disease
- Kyrle disease