- Coxitis 716.65
- Coxsackie (infection) (virus) 079.2
- Crabs, meaning pubic lice 132.2
- Crack baby 760.75
- Cracked
- Cradle cap 690.11
- Craft neurosis 300.89
- Craigiasis 007.8
- Cramp(s) 729.82
- Cranial - see condition
- Cranioclasis, fetal 763.89
- Craniocleidodysostosis 755.59
- Craniofenestria (skull) 756.0
- Craniolacunia (skull) 756.0
- Craniopagus 759.4
- Craniopathy, metabolic 733.3
- Craniopharyngeal - see condition
- Craniopharyngioma (M9350/1) 237.0
- Craniorachischisis (totalis) 740.1
- Cranioschisis 756.0
- Craniostenosis 756.0
- Craniosynostosis 756.0