- Crepitus
- Crescent or conus choroid, congenital 743.57
- Cretin, cretinism (athyrotic) (congenital) (endemic) (metabolic) (nongoitrous) (sporadic) 243
- Cretinoid degeneration 243
- Creutzfeldt-Jakob disease (syndrome) (new variant) 046.1
- Cri-du-chat syndrome 758.31
- Crib death 798.0
- Cribriform hymen 752.49
- Crigler-Najjar disease or syndrome (congenital hyperbilirubinemia) 277.4
- Crimean hemorrhagic fever 065.0
- Criminalism 301.7
- Crisis
- Crocq's disease (acrocyanosis) 443.89
- Crohn's disease (see also Enteritis, regional) 555.9
- Cronkhite-Canada syndrome 211.3
- Crooked septum, nasal 470
- Cross
- Crossed ectopia of kidney 753.3
- Crossfoot 754.50
- Croup, croupous (acute) (angina) (catarrhal) (infective) (inflammatory) (laryngeal) (membranous) (nondiphtheritic) (pseudomembranous) 464.4
- Crouzon's disease (craniofacial dysostosis) 756.0
- Crowding, teeth 524.31
