Medicare Prescription Drug Coverage
Original Medicare doesn't cover most prescription drugs on its own. Part D fills that gap. Most people who choose Original Medicare pair a standalone Part D plan with a Medigap policy — combining prescription drug coverage with protection against the medical costs Original Medicare alone doesn't cover.
📅 Reviewed and updated for 2026
Why We Keep This Page General
Medicare rules require your advisor to confirm which types of Medicare products you'd like to discuss — Medicare Advantage, Part D, Medicare Supplement — before getting into plan-specific details with you. It's called a Scope of Appointment, and it exists to protect you, not slow things down. That's why you'll find general, educational information here rather than plan-specific numbers. A quick conversation with an advisor unlocks the real specifics, tailored to your situation.
Part D is Medicare's prescription drug benefit. It's offered through private insurers approved by Medicare — never directly through the government — either as a standalone plan added to Original Medicare, or built into a Medicare Advantage plan that includes drug coverage.
How Coverage Works
Each Part D plan maintains its own list of covered medications, organized into tiers that affect how a drug is treated under that plan. Plans vary in which drugs they cover — reviewing your specific medications against a plan before enrolling is worth doing.
The Annual Cap
Your out-of-pocket drug costs under Part D are capped annually under federal law. Once you reach that cap, your plan covers the rest of your covered medication costs for the remainder of the year.
Enrolling on Time Matters
If you don't enroll in Part D when first eligible and don't have other creditable drug coverage, a permanent penalty is added to your premium for as long as you have Part D — for every month you went without coverage.
Estimate your penalty →Extra Help Is Available
A federal program called Extra Help reduces Part D costs for people with limited income and resources. Many people who qualify for full Medicaid automatically qualify for Extra Help as well.
Whether you need to shop for a Part D plan separately comes down to what kind of Medicare coverage you already have.
If You Have Original Medicare
- Original Medicare (Parts A and B) does not include drug coverage
- You'll need to add a standalone Part D plan separately
- Many people pair this with a Medigap policy for more complete, predictable coverage
If You Have Medicare Advantage
- Most Medicare Advantage plans already include drug coverage built in
- Check your specific plan — not all of them include it
- If yours does, you generally don't need or want a separate standalone Part D plan on top of it
Want to Review the Full Picture First?
The official Medicare & You handbook, published annually by CMS, covers every part of Medicare in plain language — enrollment rules, plan types, and your rights as a beneficiary. Free to read, no account needed.
Read the Medicare & You Handbook →When you're ready, a PharmSurance advisor will analyze your individual situation and help you understand your options clearly — something a general handbook can't do.
Have Questions About Your Drug Coverage?
A PharmSurance advisor can walk through how your specific medications are treated and help you understand your options — at no cost to you.
Talk to an Advisor →Your premium is the same whether you enroll through us or go directly to a carrier — what you get with PharmSurance is a personalized comparison across multiple carriers, not just one company's plans.