If O'Donnell switches to a new MA-PD plan, what will happen to her old MA HMO plan?

When an individual switches from one Medicare Advantage plan to another, such as from an MA HMO plan to a new MA-PD plan, the process of disenrollment from the old plan occurs automatically. Medicare policies are designed this way to simplify transitions between plans for beneficiaries. As a result, when O'Donnell enrolls in the new MA-PD plan, the system will initiate her disenrollment from the old MA HMO plan, ensuring that she is only enrolled in one plan at a time.

This eliminates the need for beneficiaries to worry about managing multiple plans and potentially paying for overlapping coverage. It streamlines the process, protecting the individual from facing unexpected costs or confusion that might arise from being enrolled in more than one plan simultaneously.