- Colliculitis urethralis (see also Urethritis) 597.89
- Colliers'
- Collodion baby (ichthyosis congenita) 757.1
- Colloid milium 709.3
- Coloboma NEC 743.49
- Coloenteritis - see Enteritis
- Colon - see condition
- Coloptosis 569.89
- Color
- Colostomy
- Colpitis (see also Vaginitis) 616.10
- Colpocele 618.6
- Colpocystitis (see also Vaginitis) 616.10
- Colporrhexis 665.4
- Colpospasm 625.1
- Column, spinal, vertebral - see condition
- Coma 780.01
- Combat fatigue (see also Reaction, stress, acute) 308.9
- Combined - see condition
- Comedo 706.1
- Comedocarcinoma (M8501/3) - see also Neoplasm, breast, malignant
- Comedomastitis 610.4
