- Schmorl's disease or nodes 722.30
- Schneider's syndrome 047.9
- Schneiderian
- Schnitzler syndrome 273.1
- Schoffer's tumor (see also Peritonitis) 567.29
- Scholte's syndrome (malignant carcinoid) 259.2
- Scholz (-Bielschowsky-Henneberg) syndrome 330.0
- Scholz's disease 330.0
- Schönlein (-Henoch) disease (primary) (purpura) (rheumatic) 287.0
- School examination V70.3
- Schottmüller's disease (see also Fever, paratyphoid) 002.9
- Schroeder's syndrome (endocrine-hypertensive) 255.3
- Schüller-Christian disease or syndrome (chronic histiocytosis X) 277.89
- Schultz's disease or syndrome (agranulocytosis) 288.09
- Schultze's acroparesthesia, simple 443.89
- Schwalbe-Ziehen-Oppenheimer disease 333.6
- Schwannoma (M9560/0) - see also Neoplasm, connective tissues, benign
- Schwartz (-Jampel) syndrome 359.23
- Schwartz-Bartter syndrome (inappropriate secretion of antidiuretic hormone) 253.6
- Schweninger-Buzzi disease (macular atrophy) 701.3
- Sciatic - see condition
- Sciatica (infectional) 724.3