What does Medicare Part D provide coverage for?

Medicare Part D is specifically designed to provide coverage for prescription drugs and certain medical supplies that are necessary for administering those medications. This program allows beneficiaries to receive help with the costs of their prescription medications, thus improving access to necessary treatments for chronic conditions and other health issues.

The focus of Medicare Part D is strictly on prescription drugs, including coverage for various tiers of medications based on their affordability, and it may include additional benefits like discount programs for some drug types.

In contrast, other options such as emergency medical services, long-term care, and preventive healthcare services fall under different parts of Medicare. For instance, emergency services would typically be covered under Medicare Part A or Part B, while long-term care services often require different eligibility, and preventive healthcare services are incorporated into Part B. Thus, the conclusive role of Medicare Part D is to enhance medication access and affordability for users, which makes it the correct answer.