- Chilomastigiasis 007.8
- Chin - see condition
- Chinese dysentery 004.9
- Chiropractic dislocation (see also Lesion, nonallopathic, by site) 739.9
- Chitral fever 066.0
- Chlamydia, chlamydial - see condition
- Chloasma 709.09
- Chloroma (M9930/3) 205.3
- Chlorosis 280.9
- Chlorotic anemia 280.9
- Chocolate cyst (ovary) 617.1
- Choked
- Chokes (resulting from bends) 993.3
- Choking sensation 784.99
- Cholangiectasis (see also Disease, gallbladder) 575.8
- Cholangiocarcinoma (M8160/3)
- Cholangiohepatitis 575.8
- Cholangiohepatoma (M8180/3) 155.0
- Cholangiolitis (acute) (chronic) (extrahepatic) (gangrenous) 576.1
- Cholangioma (M8160/0) 211.5
- Cholangitis (acute) (ascending) (catarrhal) (chronic) (infective) (malignant) (primary) (recurrent) (sclerosing) (secondary) (stenosing) (suppurative) 576.1
- Cholecystdocholithiasis - see Choledocholithiasis