The amount you pay for covered health care services before your insurance plan starts to pay. With a $2,000 deductible, for example, you pay the first $2,000 of covered services yourself. After you pay your deductible, you usually pay only a copayment or coinsurance for covered services. Your insurance company pays the rest. Many plans pay for certain services, like a checkup or disease management programs, before you’ve met your deductible. Check your plan details. All Marketplace health plans pay the full cost of certain preventive benefits even before you meet your deductible.Some plans have separate deductibles for certain services, like prescription drugs. Family plans often have both an individual deductible, which applies to each person, and a family deductible, which applies to all family members. Generally, plans with lower monthly premiums have higher deductibles. Plans with higher monthly premiums usually have lower deductibles.

References

https://www.healthcare.gov/glossary/deductible/