Which Medicare program requires no cost share for patients aged 65 years and older?

Medicare Part B is the correct answer as it covers a range of outpatient services, including preventive services at no cost to beneficiaries aged 65 and older. This means that for certain preventive services, adults in this age group do not need to pay a copayment, coinsurance, or deductible. Examples of these services include annual wellness visits, flu shots, and screenings for various health issues, which are essential for maintaining health and preventing more serious conditions.

While other options, such as Medicare Part C (Medicare Advantage), require beneficiaries to enroll in a private plan which may have associated costs, and Medicare Part D involves costs related to prescription drug coverage, these options do not provide the same level of cost-sharing exemption for preventive services. Similarly, Medicaid is a separate program primarily aimed at providing coverage for low-income individuals and families and includes varying cost-sharing structures based on individual circumstances. Thus, Medicare Part B stands out in that it specifically offers this no-cost share benefit for preventive care for seniors.