Which of the following statements about Medicare Part D is true?

Medicare Part D is designed to provide prescription drug coverage to individuals who are enrolled in Medicare. The statement that it is a voluntary program which can be added to Medicare Parts A and B is accurate. This means that beneficiaries have the choice to enroll in a Part D plan if they want prescription drug coverage, but it is not mandatory. Those who choose to enroll can select from a variety of private insurance plans that are approved by Medicare, allowing for a range of options to meet their needs.

While Parts A and B cover hospital and medical services respectively, Part D specifically addresses prescription medications, enhancing the overall benefits recipients receive from their Medicare coverage. This flexibility allows individuals to tailor their health care coverage according to their personal health needs and financial situations.

In contrast to this correct statement, the other options describe incorrect characteristics of Medicare Part D. It is indeed a program that involves private insurers, enrollment is not automatic but requires proactive choice by the beneficiary, and it is fundamentally different from Medicare Advantage, which offers an alternative way to receive all Medicare services rather than just prescription coverage.