- Cacergasia 300.9
- Cachexia 799.4
- Café au lait spots 709.09
- Caffey's disease or syndrome (infantile cortical hyperostosis) 756.59
- Caisson disease 993.3
- Cake kidney 753.3
- Caked breast (puerperal, postpartum) 676.2
- Calabar swelling 125.2
- Calcaneal spur 726.73
- Calcaneoapophysitis 732.5
- Calcaneonavicular bar 755.67
- Calcareous - see condition
- Calcicosis (occupational) 502
- Calciferol (vitamin D) deficiency 268.9
- Calcification
- Calcified - see also Calcification
- Calcinosis (generalized) (interstitial) (tumoral) (universalis) 275.49
- Calciphylaxis (see also Calcification, by site) 275.49
- Calcium
- Calciuria 791.9
- Calculi - see Calculus
- Calculosis, intrahepatic - see Choledocholithiasis
