- Horseshoe kidney (congenital) 753.3
- Horton's
- Hospice care V66.7
- Hospitalism (in children) NEC 309.83
- Hourglass contraction, contracture
- Household circumstance affecting care V60.9
- Housemaid's knee 727.2
- Housing circumstance affecting care V60.9
- HTLV-I infection 079.51
- HTLV-II infection 079.52
- HTLV-III (disease) (illness) (infection) - see Human immunodeficiency virus (disease) (illness) (infection)
- HTLV-III/LAV (disease) (illness) (infection) - see Human immunodeficiency virus (disease) (illness) (infection)
- Huchard's disease (continued arterial hypertension) 401.9
- Hudson-Stähli lines 371.11
- Huguier's disease (uterine fibroma) 218.9
- Hum, venous - omit code
- Human bite (open wound) - (see also Wound, open, by site)
- Human immunodeficiency virus (disease) (illness) 042
- Human immunodeficiency virus-2 infection 079.53
- Human papillomavirus 079.4
- Human T-cell lymphotrophic virus I infection 079.51
- Human T-cell lymphotrophic virus II infection 079.52
