IARC: International Agency for Research on Cancer. Międzynarodowa Agencja Badań nad Rakiem

Iatrogenic disease: illness resulting from the professional activity of a physician or of other health professionals. choroba jatrogenna

Iatrogenic injury: medical condition that has resulted from treatment. uraz jatrogenny

Ideal: standard of excellence; the ultimate aim or object for which we are striving. ideał, wzorzec

Identification card: card issued by a health plan; information on the card, especially the identification number, is required by the providers and the insurer to process claims correctly and to answer questions. identyfikator

Identification problem: (econometric analysis) inability to distinguish between two relationships (such as demand and supply) that contain the same variables, e.g. price and quantity. problem identyfikacji

IEA: International Epidemiological Association. Międzynarodowe Stowarzyszenie Epidemiologiczne

Ignitable: solid, liquid, or compressed gas that has a flash point of less than 60°C. zapalny

Ignition source: source of energy, such as heat, flame, sparks or static electricity, that is capable of causing a fuel mixture to burn. źródło zapłonu

Ignition temperature: lowest temperature at which a substance will burst into flames without an ignition source such as heat or a spark; cf. flash point. temperatura samozapłonu

Illness: sickness or abnormal condition affecting one's physical, emotional, mental spiritual, or social health. choroba

Image differentiation: use of promotional activities by a firm to differentiate consumers' perceptions of its product relative to other products in the market. indywidualizacja wizerunku

IMCI: cf. Integrated Management of Childhood Illnesses.