Final answer:
After the annual deductible is met, a Medicare Part B patient will pay 20% of the remaining covered expenses.
Step-by-step explanation:
The question refers to the cost-sharing aspect of Medicare Part B after the annual deductible is met. Once the deductible is paid, Medicare Part B typically covers 80% of the remaining approved medical expenses. Therefore, for services and items Medicare covers, the patient is responsible for the remaining 20% as coinsurance. This is a form of cost-sharing that helps to prevent excessive use of medical services.