To be eligible for Medicare Advantage (Part C), what must beneficiaries also be enrolled in?

To be eligible for Medicare Advantage, also known as Medicare Part C, beneficiaries must be enrolled in both Medicare Part A (hospital insurance) and Medicare Part B (medical insurance). Medicare Advantage plans are an alternative to Original Medicare, and they are offered by private insurance companies that contract with Medicare. These plans provide all the benefits of Parts A and B, usually include additional benefits like vision or dental coverage, and often include prescription drug coverage.

The requirement to enroll in both Parts A and B ensures that beneficiaries have comprehensive health coverage, as Medicare Advantage plans replace the traditional Medicare framework. Without enrollment in both parts, beneficiaries would not qualify for a Medicare Advantage plan. This is why the correct answer emphasizes the necessity of having both Medicare Parts A and B for eligibility in Medicare Advantage.