- Hobo, hoboism V60.0
- Hodgkin's
- Hodgson's disease (aneurysmal dilatation of aorta) 441.9
- Hodi-potsy 111.0
- Hoffa (-Kastert) disease or syndrome (liposynovitis prepatellaris) 272.8
- Hoffmann's syndrome 244.9 [359.5]
- Hoffmann-Bouveret syndrome (paroxysmal tachycardia) 427.2
- Hole
- Holla disease (see also Spherocytosis) 282.0
- Holländer-Simons syndrome (progressive lipodystrophy) 272.6
- Hollow foot (congenital) 754.71
- Holmes' syndrome (visual disorientation) 368.16
- Holoprosencephaly 742.2
- Holthouse's hernia - see Hernia, inguinal
- Homesickness 309.89
- Homicidal ideation V62.85
- Homocystinemia 270.4
- Homocystinuria 270.4
- Homologous serum jaundice (prophylactic) (therapeutic) - see Hepatitis, viral
- Homosexuality - omit code
- Homozygous Hb-S disease 282.61
- Honeycomb lung 518.89
