- Chabert's disease 022.9
- Chacaleh 266.2
- Chafing 709.8
- Chagas' disease (see also Trypanosomiasis, American) 086.2
- Chagres fever 084.0
- Chalasia (cardiac sphincter) 530.81
- Chalazion 373.2
- Chalazoderma 757.39
- Chalcosis 360.24
- Chalicosis (occupational) (pulmonum) 502
- Chancre (any genital site) (hard) (indurated) (infecting) (primary) (recurrent) 091.0
- Chancriform syndrome 114.1
- Chancroid 099.0
- Chandipura fever 066.8
- Chandler's disease (osteochondritis dissecans, hip) 732.7
- Change(s) (of) - see also Removal of
- Changing sleep-work schedule, affecting sleep 327.36
- Changuinola fever 066.0
- Chapping skin 709.8
- Character
- Charcôt's
- Charcôt-Marie-Tooth disease, paralysis, or syndrome 356.1