- Insanity, insane (see also Psychosis) 298.9
- Insect
- Insemination, artificial V26.1
- Insensitivity
- Insertion
- Insolation 992.0
- Insomnia, unspecified 780.52
- Inspiration
- Inspissated bile syndrome, newborn 774.4
- Instability
- Insufficiency, insufficient
- Insufflation
- Insular - see condition
- Insulinoma (M8151/0)
- Insuloma - see Insulinoma
- Insult
- Insurance examination (certification) V70.3
- Intemperance (see also Alcoholism) 303.9
- Interception of pregnancy (menstrual extraction) V25.3
- Intermenstrual
- Intermittent - see condition
- Internal - see condition
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