- Impaludism - see Malaria
- Impediment, speech NEC 784.5
- Impending
- Imperception, auditory (acquired) (congenital) 389.9
- Imperfect
- Imperfectly descended testis 752.51
- Imperforate (congenital) - see also Atresia
- Impervious (congenital) - see also Atresia
- Impetiginization of other dermatoses 684
- Impetigo (any organism) (any site) (bullous) (circinate) (contagiosa) (neonatorum) (simplex) 684
- Impingement, soft tissue between teeth 524.89
- Implant, endometrial 617.9
- Implantation
- Impotence (sexual) 607.84
- Impoverished blood 285.9
- Impression, basilar 756.0
- Imprisonment V62.5
- Improper
- Improperly tied umbilical cord (causing hemorrhage) 772.3
- Impulses, obsessional 300.3
- Impulsive neurosis 300.3
- Inaction, kidney (see also Disease, renal) 593.9