Part D drug plans: small premiums, big fine print.
How prescription coverage works in 2026, the four questions that pick the right plan, and why the details matter.
How Part D works in 2026
The key features of stand-alone prescription drug coverage
| Feature | 2026 figure | What it means |
|---|---|---|
| Annual deductible | $615 | Some plans waive it for certain drugs |
| Out-of-pocket cap | $2,100 | Firm annual limit on drug spending |
| Average monthly premium | ~$34.50 | Varies by plan and ZIP code |
| Payment smoothing | Manufacturer discount in coverage gap | You pay less in the gap than before 2025 |
| Late enrollment penalty | 1% per month | Added to premium for every month without creditable coverage |
The four questions that pick your plan
List every drug, dosage, and frequency
The plan formulary determines your cost. If your drug is not on the formulary or is placed on a high tier, you pay more. We need exact names, dosages, and how often you take them.
Identify your pharmacy
Each plan has preferred and standard pharmacies. Using a preferred pharmacy can save $10 to $50 per fill. If you have a pharmacy you trust, we start there.
Compare total annual cost, not just premium
A $15/month premium with $40 copays may cost more than a $40/month premium with $5 copays. We model the full year based on your actual prescriptions.
Check for coverage gap behavior
Before the $2,100 cap, some plans handle the coverage gap differently. We verify what you pay at each stage: deductible, initial coverage, gap, and catastrophic.
Frequently asked questions
What happens if I do not enroll in Part D when first eligible?
You will face a late enrollment penalty of 1% of the national base premium for every month you went without creditable prescription drug coverage after your initial enrollment period. This penalty is added to your Part D premium permanently — it never goes away.
What is the coverage gap (donut hole)?
The coverage gap begins after your total drug costs reach a set threshold. In 2026, you pay no more than 25% of the cost of brand-name and generic drugs in the gap until you reach the $2,100 out-of-pocket cap, after which you pay nothing for covered drugs.
How do I know if my drugs are covered?
Each Part D plan publishes a formulary, a list of covered drugs organized into tiers. We check your specific medications against the formulary for every plan available in your area and show you the tier placement and expected copay for each drug.
Can I use mail-order pharmacy with Part D?
Most Part D plans offer a mail-order option through a preferred mail-order pharmacy, often at a 90-day supply for the same copay as two 30-day fills at a retail pharmacy. This is convenient for maintenance medications you take regularly.
What is Extra Help, and do I qualify?
Extra Help, also called the Low-Income Subsidy, is a federal program that helps pay Part D premiums, deductibles, and copays. Eligibility is based on income and resources. In 2026, most people with income below about $22,000 for a single person qualify.
Want your exact drug list priced across every plan?
Bring your medications and we model the full-year cost for every Part D plan in your ZIP code.