- Duplex - see also Accessory
- Duplication - see also Accessory
- Dupré's disease or syndrome (meningism) 781.6
- Dupuytren's
- Durand-Nicolas-Favre disease (climatic bubo) 099.1
- Duroziez's disease (congenital mitral stenosis) 746.5
- Dust
- Dutton's
- Dwarf, dwarfism 259.4
- Dyke-Young anemia or syndrome (acquired macrocytic hemolytic anemia) (secondary) (symptomatic) 283.9
- Dynia abnormality (see also Defect, coagulation) 286.9
- Dysacousis 388.40
- Dysadrenocortism 255.9
- Dysarthria 784.5
- Dysautonomia (see also Neuropathy, peripheral, autonomic) 337.9
- Dysbarism 993.3
- Dysbasia 719.7
- Dysbetalipoproteinemia (familial) 272.2
- Dyscalculia 315.1
- Dyschezia (see also Constipation) 564.00
- Dyschondroplasia (with hemangiomata) 756.4
- Dyschondrosteosis 756.59