- Deferentitis 608.4
- Defibrination syndrome (see also Fibrinolysis) 286.6
- Deficiency, deficient
- Deficient - see also Deficiency
- Deficit
- Deflection
- Defluvium
- Deformity 738.9
- Degeneration, degenerative
- Deglutition
- Degos' disease or syndrome 447.8
- Degradation disorder, branched-chain amino-acid 270.3
- Dehiscence
- Dehydration (cachexia) 276.51
- Deiters' nucleus syndrome 386.19
- Déjérine's disease 356.0
- Déjérine-Klumpke paralysis 767.6
- Déjérine-Roussy syndrome 338.0
- Déjérine-Sottas disease or neuropathy (hypertrophic) 356.0
- Déjérine-Thomas atrophy or syndrome 333.0
- Del Castillo's syndrome (germinal aplasia) 606.0
- Delay, delayed