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Medicare Part D is a voluntary program that provides prescription drug coverage to individuals who are eligible for Medicare. It was established to help reduce the cost of prescription medications for Medicare beneficiaries, allowing them to access necessary medications at lower out-of-pocket expenses.

This program is not mandatory, which is a key aspect that differentiates it from some other Medicare components. Beneficiaries can choose whether to enroll in Part D, and if they do, they pay a monthly premium along with potential deductibles and copayments for their prescription drugs.

The voluntary nature of Medicare Part D means that it is widely available to all Medicare recipients, regardless of their income level or specific healthcare needs, thus also making it a comprehensive option that can enhance their overall healthcare plan. Additionally, it isn't limited to low-income individuals, as anyone who qualifies for Medicare can opt into the program, highlighting its accessibility to a broader audience.