- Stein-Leventhal syndrome (polycystic ovary) 256.4
- Steinbrocker's syndrome (see also Neuropathy, peripheral, autonomic) 337.9
- Steinert's disease 359.2
- Stenocardia (see also Angina) 413.9
- Stenocephaly 756.0
- Stenosis (cicatricial) - see also Stricture
- Stercolith (see also Fecalith) 560.39
- Stercoraceous, stercoral ulcer 569.82
- Stereopsis, defective
- Stereotypies NEC 307.3
- Sterility
- Sterilization, admission for V25.2
- Sternalgia (see also Angina) 413.9
- Sternopagus 759.4
- Sternum bifidum 756.3
- Sternutation 784.9
- Steroid
- Stevens-Johnson disease or syndrome (erythema multiforme exudativum) 695.1
- Stewart-Morel syndrome (hyperostosis frontalis interna) 733.3
- Sticker's disease (erythema infectiosum) 057.0
- Stickler syndrome 759.89
- Sticky eye 372.03