• Sideropenia (see also Anemia, iron deficiency) 280.9
  • Siderosis (lung) (occupational) 503
  • Siegal-Cattan-Mamou disease (periodic) 277.31
  • Siemens' syndrome
  • Sighing respiration 786.7
  • Sigmoid
  • Sigmoiditis - see Enteritis
  • Silfverskiöld's syndrome 756.50
  • Silicosis, silicotic (complicated) (occupational) (simple) 502
  • Silicotuberculosis (see also Tuberculosis) 011.4
  • Silo fillers' disease 506.9
  • Silver wire arteries, retina 362.13
  • Silver's syndrome (congenital hemihypertrophy and short stature 759.89
  • Silvestroni-Bianco syndrome (thalassemia minima) 282.49
  • Simian crease 757.2
  • Simmonds' cachexia or disease (pituitary cachexia) 253.2
  • Simons' disease or syndrome (progressive lipodystrophy) 272.6
  • Simple, simplex - see condition
  • Sinding-Larsen disease (juvenile osteopathia patellae) 732.4
  • Singapore hemorrhagic fever 065.4
  • Singers' node or nodule 478.5
  • Single