- India rubber skin 756.83
- Indicanuria 270.2
- Indigestion (bilious) (functional) 536.8
- Indirect - see condition
- Indolent bubo NEC 099.8
- Induced
- Induratio penis plastica 607.89
- Induration, indurated
- Industrial - see condition
- Inebriety (see also Abuse, drugs, nondependent) 305.0
- Inefficiency
- Inelasticity, skin 782.8
- Inequality, leg (acquired) (length) 736.81
- Inertia
- Infant - see also condition
- Infantile - see also condition
- Infantilism 259.9
- Infants, healthy liveborn - see Newborn
- Infarct, infarction
- Infecting - see condition
- Infection, infected, infective (opportunistic) 136.9
- Infective, infectious - see condition