A deductible is the amount that you have to pay for your health care each year before your insurance starts paying for your care. Similar to car insurance, many health plans require you pay a certain amount out-of-pocket before the coverage kicks in. For example, if you have a deductible of $1500 you have to pay the first $1500 of your medical costs before your insurance starts paying. In some plans the deductible applies only to services that you get outside of the provider network. Also, some plans have a separate deductible for prescription medications. Usual deductible does not apply for preventive services.