- Stilling-Türk-Duane syndrome (ocular retraction syndrome) 378.71
- Stimulation, ovary 256.1
- Sting (animal) (bee) (fish) (insect) (jellyfish) (Portuguese man-o-war) (wasp) (venomous) 989.5
- Stippled epiphyses 756.59
- Stitch
- Stojano's (subcostal) syndrome 098.86
- Stokes' disease (exophthalmic goiter) 242.0
- Stokes-Adams syndrome (syncope with heart block) 426.9
- Stokvis' (-Talma) disease (enterogenous cyanosis) 289.7
- Stoma malfunction
- Stomach - see condition
- Stomatitis 528.00
- Stomatocytosis 282.8
- Stomatomycosis 112.0
- Stomatorrhagia 528.9
- Stone(s) - see also Calculus
- Stonecutters' lung 502
- Stonemasons'
- Stoppage
- Storm, thyroid (apathetic) (see also Thyrotoxicosis) 242.9
- Strabismus (alternating) (congenital) (nonparalytic) 378.9
- Strain - see also Sprain, by site