The post A Rule Caps Medicare’s Drug-Plan Base at a 6% Rise. Your Own Plan’s Premium Isn’t Protected appeared first on 24/7 Wall St.. A 68-year-old opens her Annual Notice of Change in late September and sees the monthly premium on her standalone Part D drug plan jumping from $42 to $58 for the coming year. She remembers reading headlines that Medicare had limited Part D premium increases. So why is her bill rising by more than a third? Because …