Which of the following is NOT an eligibility requirement for enrolling in a Medicare Advantage plan?

The reason that not having any pre-existing conditions is not an eligibility requirement for enrolling in a Medicare Advantage plan is that these plans cannot deny coverage based on health status or pre-existing conditions. In fact, Medicare Advantage plans are designed to offer a range of services to all eligible individuals, regardless of their health history.

In contrast, individuals must indeed be at least 65 years old to qualify for Medicare, as Medicare is primarily targeted toward seniors. Enrollment in both Medicare Part A and Part B is also necessary, as Medicare Advantage plans serve as an alternative to traditional Medicare, incorporating the benefits of both parts. Being a US citizen or a legal resident is another critical requirement, as Medicare is available to those who meet this residency condition. Thus, the correct answer reflects the inclusive nature of Medicare Advantage plans regarding eligibility based on health, distinguishing it from traditional insurance practices that may involve health assessments.