- Scotoma (ring) 368.44
- Scratch - see Injury, superficial, by site
- Scratchy throat 784.99
- Screening (for) V82.9
- Scrofula (see also Tuberculosis) 017.2
- Scrofulide (primary) (see also Tuberculosis) 017.0
- Scrofuloderma, scrofulodermia (any site) (primary) (see also Tuberculosis) 017.0
- Scrofulosis (universal) (see also Tuberculosis) 017.2
- Scrofulosis lichen (primary) (see also Tuberculosis) 017.0
- Scrofulous - see condition
- Scrotal tongue 529.5
- Scrotum - see condition
- Scurvy (gum) (infantile) (rickets) (scorbutic) 267
- Sea-blue histiocyte syndrome 272.7
- Seabright-Bantam syndrome (pseudohypoparathyroidism) 275.49
- Seasickness 994.6
- Seatworm 127.4
- Sebaceous
- Sebocystomatosis 706.2
- Seborrhea, seborrheic 706.3
- Seckel's syndrome 759.89
- Seclusion pupil 364.74
