When might a Corridor Deductible be applicable in a health insurance plan?

A Corridor Deductible is used in health insurance plans, particularly in the context of supplemental or major medical insurance. Its function comes into play after the base plan has exhausted its benefits, meaning the primary insurance has paid out its maximum limit. The Corridor Deductible is the amount the insured must pay out-of-pocket before the major medical coverage kicks in to cover the remaining expenses.

This typically occurs after the base plan has paid its share but before the more comprehensive major medical coverage starts. Therefore, option B accurately describes this situation. The insured must meet this deductible, which separates the benefits of the base plan from the enhanced coverage of the major medical plan, ensuring that there is a defined threshold that must be crossed before more extensive benefits can be accessed.