If you’re looking for prescription coverage plans, Medicare Part D can be a standalone option or combined with a Medicare Advantage plan (Part C). Certain plans will only work with specific pharmacy networks or provide mail-in orders for discounted prices. Prescription coverage plans are available from Medicare-approved private insurance companies. Your options will vary based on where you live. Also, keep in mind that Medicare Part D costs and coverage are above the standard Medicare plans. You must enroll in Part A or B to get a Medicare Part D plan.