• Cinchonism
  • Circine herpes 110.5
  • Circle of Willis - see condition
  • Circular - see also condition
  • Circulating anticoagulants, antibodies, or inhibitors (see also Anticoagulants) 286.59
  • Circulation
  • Circulatory system - see condition
  • Circulus senilis 371.41
  • Circumcision
  • Circumscribed - see condition
  • Circumvallata placenta - see Placenta, abnormal
  • Cirrhosis, cirrhotic 571.5
  • Cistern, subarachnoid 793.0
  • Citrullinemia 270.6
  • Citrullinuria 270.6
  • Ciuffini-Pancoast tumor (M8010/3) (carcinoma, pulmonary apex) 162.3
  • Civatte's disease or poikiloderma 709.09
  • CJD (Creutzfeldt-Jakob disease) 046.19
  • CLABSI (central line-associated bloodstream infection) 999.32
  • Clam diggers' itch 120.3
  • Clap - see Gonorrhea
  • Clark's paralysis 343.9