Deductible (health coverage)
A deductible is the amount you pay for covered care each year before your health plan starts to pay its share.
In plain words
Until you reach your deductible, you pay the full cost of covered services yourself. After it, you share costs with the plan through a copay or coinsurance, until you reach the out-of-pocket maximum.
Many plans cover some preventive care before the deductible. Plans with a lower monthly premium often have a higher deductible, and the other way round.