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 take few or no prescriptions today, it helps to review your drug coverage before your Medicare enrollment dates. Confirm whether your current coverage is creditable and how any change could affect your costs or enrollment timing.
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
After your Part D Initial Enrollment Period ends, a gap of 63 days or more in a row without Medicare drug coverage or other creditable prescription drug coverage may lead to a late enrollment penalty when you join a drug plan. Creditable coverage is expected to pay, on average, at least as much as Medicare’s standard drug coverage. Review your coverage dates and any creditable coverage notices before deciding when to enroll.
Estimate Your Penalty
10 full uncovered months × 1% × $38.99 = $3.90/month
Rounded to the nearest $0.10.
Some employer, union, or retiree plans provide creditable drug coverage; confirm your plan’s status and keep its notice. VA prescription coverage is generally creditable. You do not pay a Part D late enrollment penalty while receiving Extra Help. If you are unsure about your coverage or assistance, bring your notices to an AdviseCare review.
This educational estimate uses the 2026 national base beneficiary premium of $38.99. This is a calculation amount, not your plan’s monthly premium. The base amount changes annually, so a penalty can change too. Your plan will tell you whether a penalty applies and the amount.
A Part D late enrollment penalty generally continues for as long as you have Medicare drug coverage, even if you change plans. Exceptions apply, including Extra Help and a new Initial Enrollment Period for someone who had Medicare before age 65. Ask your plan to review your situation if you think a penalty is incorrect.
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?
You may owe a Part D late enrollment penalty after a gap of 63 days or more without Medicare drug coverage or other creditable coverage following your Part D Initial Enrollment Period. The monthly amount is based on full uncovered months and the national base beneficiary premium. It generally continues while you have Medicare drug coverage, but exceptions apply, including Extra Help. Your plan determines whether you owe a penalty.
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.