Most Medicare users know about deductibles and copays, but fewer realize that Part D prescription drug plans come with several hidden caps that can quietly limit coverage. These caps determine how much your plan pays—and when you’re on the hook for the rest. With new rules phasing in through 2025, understanding these limits is more important than ever. Many retirees assume “coverage” means protection from big bills, only to be blindsided by thresholds buried in fine print. Here are the lesser-known Medicare Part D caps you need to watch for before they drain your wallet.
