This represents the amount of eligible medical expenses that must be paid by the insured before the insurance company begins to reimburse for covered expenses. As an example, if you purchase a plan with a $50 deductible and incur $200 of expenses, the insurance company will begin to reimburse for expenses after you have paid the first $50 of your medical bills.
There are two different kinds of deductibles, per-claim and per-policy period. A per claim deductible means that the insured must pay a new deductible for each separate incident. (Example: pay the deductible once for a broken leg and then a second time for a flu treatment). A per-policy period deductible means that the insured must pay the deductible only once during the period of the insurance policy. If your plan has a $100 deductible, you pay the first $100 of the expenses and then the insurance company picks up the rest. The higher the deductible, the lower the premium cost and vice versa.