Medicare Part D Explained: Costs, Penalties & $2,100 Cap (2026)
When people first enroll in Medicare, Part D can seem like one of the simpler pieces. It's prescription drug coverage. So I frequently hear: “I don't take any medications. Why should I pay for Part D?” Or: “Part D is optional. Can't I just enroll later if I need medication?” And another common question is: “Should I just choose the plan with the lowest premium?” Those questions make sense. But Medicare Part D is not simply about: “What medications do I take today?” When I help someone compare Part D, I focus on four questions: 1. Did you get drug coverage when you needed to? 2. How does the plan cover the medications you actually take? 3. What will your total annual drug cost plus premium really be? 4. Is this year's plan still a good choice for next year? Once you understand those four ideas, Part D becomes much easier to evaluate. Insurance Dr.'s Bottom Line Medicare Part D itself is optional. But if you don't have Part D, you should know whether you have o...