- Salivary duct or gland - see also condition
- Salivation (excessive) (see also Ptyalism) 527.7
- Salmonella (aertrycke) (choleraesuis) (enteritidis) (gallinarum) (suipestifer) (typhimurium) (see also Infection, Salmonella) 003.9
- Salmonellosis 003.0
- Salpingitis (catarrhal) (fallopian tube) (nodular) (pseudofollicular) (purulent) (septic) (see also Salpingo-oophoritis) 614.2
- Salpingo-oophoritis (catarrhal) (purulent) (ruptured) (septic) (suppurative) 614.2
- Salpingo-ovaritis (see also Salpingo-oophoritis) 614.2
- Salpingocele 620.4
- Salpingoperitonitis (see also Salpingo-oophoritis) 614.2
- Salt-losing
- Salt-rheum (see also Eczema) 692.9
- Salzmann's nodular dystrophy 371.46
- Sampson's cyst or tumor 617.1
- San Joaquin Valley fever 114.0
- Sandblasters'
- Sander's disease (paranoia) 297.1
- Sandfly fever 066.0
- Sandhoff's disease 330.1
- Sanfilippo's syndrome (mucopolysaccharidosis III) 277.5
- Sanger-Brown's ataxia 334.2
- Sao Paulo fever or typhus 082.0
- Saponification, mesenteric 567.89