- Stave fracture - see Fracture, metacarpus, metacarpal bone(s)
- Steal
- Stealing, solitary, child problem (see also Disturbance, conduct) 312.1
- Steam burn - see Burn, by site
- Steatocystoma multiplex 706.2
- Steatoma (infected) 706.2
- Steatorrhea (chronic) 579.8
- Steatosis 272.8
- Steele-Richardson (-Olszewski) Syndrome 333.0
- Stein's syndrome (polycystic ovary) 256.4
- Stein-Leventhal syndrome (polycystic ovary) 256.4
- Steinbrocker's syndrome (see also Neuropathy, peripheral, autonomic) 337.9
- Steinert's disease 359.21
- STEMI (ST elevation myocardial infarction) (see also - Infarct, myocardium, ST elevation) 410.9
- Stenocardia (see also Angina) 413.9
- Stenocephaly 756.0
- Stenosis (cicatricial) - see also Stricture
- Stent jail 996.72
- Stercolith (see also Fecalith) 560.32
- Stercoraceous, stercoral ulcer 569.82
- Stereopsis, defective
- Stereotypies NEC 307.3