- Cord - see also condition
- Cord's angiopathy (see also Tuberculosis) 017.3 [362.18]
- Cordis ectopia 746.87
- Corditis (spermatic) 608.4
- Corectopia 743.46
- Cori type glycogen storage disease - see Disease, glycogen storage
- Cork-handlers' disease or lung 495.3
- Corkscrew esophagus 530.5
- Corlett's pyosis (impetigo) 684
- Corn (infected) 700
- Cornea - see also condition
- Cornelia de Lange's syndrome (Amsterdam dwarf, mental retardation, and brachycephaly) 759.89
- Cornu cutaneum 702.8
- Cornual gestation or pregnancy - see Pregnancy, cornual
- Coronary (artery) - see also condition
- Corpora - see also condition
- Corpulence (see also Obesity)
- Corpus - see condition
- Corrigan's disease - see Insufficiency, aortic
- Corrosive burn - see Burn, by site
- Corsican fever (see also Malaria) 084.6
- Cortical - see also condition