- Cardiorenal - see condition
- Cardiorrhexis (see also Infarct, myocardium) 410.9
- Cardiosclerosis - see Arteriosclerosis, coronary
- Cardiosis - see Disease, heart
- Cardiospasm (esophagus) (reflex) (stomach) 530.0
- Cardiostenosis - see Disease, heart
- Cardiosymphysis 423.1
- Cardiothyrotoxicosis - see Hyperthyroidism
- Cardiovascular - see condition
- Carditis (acute) (bacterial) (chronic) (subacute) 429.89
- Care (of)
- Caries (bone) (see also Tuberculosis, bone) 015.9 [730.8]
- Carini's syndrome (ichthyosis congenita) 757.1
- Carious teeth 521.00
- Carneous mole 631
- Carnosinemia 270.5
- Carotid body or sinus syndrome 337.01
- Carotidynia 337.01
- Carotinemia (dietary) 278.3
- Carotinosis (cutis) (skin) 278.3
- Carpal tunnel syndrome 354.0
- Carpenter's syndrome 759.89
