Deductible:

The amount you owe for health care services your plan covers before your plan begins to pay.
 
Example: If your deductible is $1000, your plan won't pay anything until you've met your $1000 deductible for covered health services subject to the deductible. The deductible may not apply to all services (like an annual preventive care visit to your doctor).
 
Note: If you're enrolled in a consumer-directed health plan with one or more family members, you must meet the entire family deductible before the plan begins paying benefits.
 
  
 
See your plan's certificate of coverage for details on what does and doesn't apply toward the plan's deductible.

You can also see each plan's deductible: