- 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
- 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
- Hong Kong ear 117.3
- HOOD (hereditary osteo-onychodysplasia) 756.89
- Hooded
- Hookworm (anemia) (disease) (infestation) - see Ancylostomiasis
- Hoppe-Goldflam syndrome 358.00
- Hordeolum (external) (eyelid) 373.11
- Horn
- Horner's
