- Strands
- Strangulation, strangulated 994.7
- Strangury 788.1
- Straw itch 133.8
- Strawberry
- Streak, ovarian 752.0
- Strephosymbolia 315.01
- Streptobacillary fever 026.1
- Streptobacillus moniliformis 026.1
- Streptococcemia 038.0
- Streptococcicosis - see Infection, streptococcal
- Streptococcus, streptococcal - see condition
- Streptoderma 686.00
- Streptomycosis - see Actinomycosis
- Streptothricosis - see Actinomycosis
- Streptothrix - see Actinomycosis
- Streptotrichosis - see Actinomycosis
- Stress 308.9
- Stretching, nerve - see Injury, nerve, by site
- Striae (albicantes) (atrophicae) (cutis distensae) (distensae) 701.3
- Striations of nails 703.8
- Stricture (see also Stenosis) 799.89