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In property insurance, requires the policyholder to carry insurance equal to a specified percentage of the value of property to receive full pay-ment on a loss. For health insurance, it is a percentage of each claim above the deductible paid by the policy-holder. For a 20 percent health insurance coinsurance clause, the policyholder pays for the deductible plus 20 percent of his covered losses. After paying 80 per-cent of losses up to a specified ceiling, the insurer starts paying 100 percent of losses.