Final answer:
Medicare is the last resort insurance payment system, billed after all other insurances. It mainly serves individuals over sixty-five, with beneficiaries paying part of their healthcare costs through deductibles, copayments, and co-insurance.
Step-by-step explanation:
A patient can have more than one insurance plan, but Medicare is always the payment of last resort, billed after all other insurances have been paid. Therefore, the correct answer is (d) Medicare. Medicare is a public healthcare system offering insurance primarily to people over sixty-five years old, as well as to some younger individuals with disabilities or specific conditions. It's divided into parts, such as Part B, which is optional insurance covering healthcare costs outside of hospital stays, including physician services, medical tests, and outpatient visits. In addition to a monthly fee, beneficiaries may encounter deductibles, copayments, and co-insurance payments, where they are responsible for a percentage of the healthcare costs.