- Scheuthauer-Marie-Sainton syndrome (cleidocranialis dysostosis) 755.59
- Schilder (-Flatau) disease 341.1
- Schilling-type monocytic leukemia (M9890/3) 206.9
- Schimmelbusch's disease, cystic mastitis, or hyperplasia 610.1
- Schirmer's syndrome (encephalocutaneous angiomatosis) 759.6
- Schistocelia 756.79
- Schistoglossia 750.13
- Schistosoma infestation - see Infestation, Schistosoma
- Schistosomiasis 120.9
- Schizencephaly 742.4
- Schizo-affective psychosis (see also Schizophrenia) 295.7
- Schizodontia 520.2
- Schizoid personality 301.20
- Schizophrenia, schizophrenic (reaction) 295.9
- Schizothymia 301.20
- Schlafkrankheit 086.5
- Schlatter's tibia (osteochondrosis) 732.4
- Schlatter-Osgood disease (osteochondrosis, tibial tubercle) 732.4
- Schloffer's tumor (see also Peritonitis) 567.29
- Schmidt's syndrome
- Schmincke
- Schmitz (-Stutzer) dysentery 004.0
