Medicare Part D Prescription Drug Coverage
Review medication coverage, pharmacy options, and estimated costs before choosing a Part D plan.
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Why Part D Matters
Even if you don't take many medications now, having Part D coverage protects you from the late enrollment penalty and ensures you're covered when you need it. Prescription drug needs often increase with age, and the cost of medications without coverage can be devastating.
The right Part D plan can save you hundreds, even thousands, of dollars each year. Let us help you find it.
How Part D Works
New to Medicare? Start with Understanding Medicare basics.
Medicare Part D provides prescription drug coverage through private insurance plans approved by Medicare. You can get Part D coverage in two ways:
- Standalone PDP. A separate Part D plan paired with Original Medicare or a Medigap policy.
- Medicare Advantage (MAPD). An all-in-one plan that bundles Part D drug coverage with your medical benefits.
Each plan has a formulary: a list of covered medications organized into tiers. Lower tiers (generics) cost less; higher tiers (brand-name, specialty) cost more.
Formulary Tiers
Key Costs to Understand
Part D plans have several cost components. Understanding them helps you choose the right plan.
Monthly Premium
The fixed amount you pay each month for your Part D plan. Premiums vary by plan and region.
Annual Deductible
The amount you pay out of pocket before your plan starts covering costs. Some plans have $0 deductibles.
Copays / Coinsurance
Your share of the cost each time you fill a prescription. Amounts depend on the drug's formulary tier.
Annual Max Out-of-Pocket
Once you reach this limit, your plan covers 100% of your drug costs for the rest of the year.
Late Enrollment Penalty
If you don't sign up for Part D when you're first eligible and go 63 or more consecutive days without creditable prescription drug coverage, you may have to pay a late enrollment penalty for as long as you have Part D coverage.
Estimate Your Penalty
10 months × 1% × $36.78 = $3.68/month
You may be exempt if you had:
- Employer or union group health coverage with creditable drug benefits
- VA benefits providing prescription coverage
- Creditable retiree health coverage
Based on the 2026 national base beneficiary premium ($36.78). CMS recalculates this each year.
This penalty is added to your monthly premium permanently. It never goes away, and it can increase each year as the base premium changes.
Check Your Medications Before You Enroll
Not every Part D plan covers the same medications. Before choosing a plan, it's important to:
- Confirm your drugs are on the formulary. Make sure each medication you take is covered by the plan.
- Check preferred pharmacy networks. Using an in-network or preferred pharmacy can significantly lower your costs.
- Compare total annual costs. Look beyond just the premium. Factor in deductibles, copays, and tier placement.
Part D Questions, Answered
What is Medicare Part D?
Medicare Part D is prescription drug coverage offered by private insurance companies approved by Medicare. It helps cover the cost of prescription medications.
Do I need Part D if I have Medicare Advantage?
Most Medicare Advantage (MAPD) plans already include Part D drug coverage. If your plan includes it, you do not need a separate standalone PDP.
What is the Part D late enrollment penalty?
If you go 63 or more consecutive days without creditable drug coverage, you may owe a permanent penalty. It's calculated as 1% of the national base beneficiary premium times the number of months you went without coverage.
How do I know if my medications are covered?
Each Part D plan has a formulary, a list of covered drugs organized by tiers. You can check your plan's formulary online or ask us to verify your medications before enrolling.