Which of the following is NOT one of the four parts of Medicare?

Medicare is structured into four defined parts: Part A, Part B, Part C, and Part D. Each part addresses different aspects of healthcare coverage for eligible individuals, primarily those aged 65 and older or those with specific disabilities.

Part A covers inpatient hospital stays, skilled nursing facility care, hospice care, and some home health care. Part B focuses on outpatient care, including doctor visits, preventive services, and outpatient hospital services. Part C, or Medicare Advantage, allows beneficiaries to receive their Medicare benefits through private insurance plans that may incorporate coverage from multiple parts. Finally, Part D offers prescription drug coverage.

Since D is not part of this established framework, it is the correct choice as the option that is not a part of Medicare. The existence of only four parts—A, B, C, and D—clarifies that while the first three are essential components of the Medicare program, E does not exist within this system.