One limb, one eye or is it both the kidneys that need to be non functional for a claim to be cleared? Well, you cannot decide on how an illness will hit you, but insurance policies may have clearly marked exclusions that will decide how gory things need to be with illnesses for you to make a claim and be paid. The fundamentals on which claims on critical illness riders rests could be stringent enough and may actually seem restrictive with what is offered and what is not.