Medicare Part D Explained: Drug Costs, the Yearly Cap, and the Late Penalty

Medicare Part D: What You'll Pay for Drugs, and How the Yearly Cap Works

Key takeaways

• Part D is Medicare drug coverage. Private plans approved by Medicare offer it.[1]
• There is now a yearly cap on what you pay for covered drugs: $2,100 in 2026 and $2,400 in 2027.[1][2]
• After you hit the cap, you pay $0 for covered Part D drugs for the rest of the year.[1]
• The highest deductible a plan may charge is $615 in 2026 and $700 in 2027.[1]
• Going 63 days or more without drug coverage can mean a lifelong penalty.[1]
• Extra Help can lower costs if your income is limited.[1]

The numbers at a glance

Your own premium depends on your plan. People with higher incomes may pay more.[1]

The 3 cost stages

1. Deductible. If your plan has one, you pay full price until you reach it. Some plans have none.[1]
2. Initial coverage. You pay 25% of the cost of covered drugs until you reach the yearly cap.[1]
3. Catastrophic coverage. You pay $0 for covered drugs for the rest of the calendar year.[1]

Some payments made for you, like Extra Help, also count toward the cap.[1]

Each month you use the plan, you get an Explanation of Benefits. It shows which stage you are in.[1]

Spread big bills out

The Medicare Prescription Payment Plan lets you spread drug costs over the year. It does not lower your total cost.[1]

The late enrollment penalty

You may owe a penalty if you go 63 or more days in a row without Part D or other "creditable" drug coverage after your first window.[1]

How it is figured: 1% × the national base premium × the number of uncovered months.[1]

Example (2026 base): Wait 14 months → 14% × $38.99 ≈ $5.46, rounded to $5.50 a month. This is added to your premium for as long as you have Part D.[1]

Tip: Even if you take few drugs, a low-premium plan can protect you from the penalty.[1]

Ways to pay less

• Extra Help: automatic if you get Medicaid, a Medicare Savings Program, or SSI. Others can apply.[1] See Medicaid eligibility.
• State Pharmaceutical Assistance Programs in some states.[1]
• Drug-company assistance programs.[1]

Pick a plan: original checklist

• List every drug, dose, and how often.
• Enter all of them at Medicare.gov/plan-compare.
• Check your pharmacy is in network.
• Compare the estimated yearly total, not just the premium.
• Re-check each fall during Open Enrollment (Oct 15 – Dec 7). See Medicare enrollment.

Free, unbiased help: your SHIP (find yours at shiphelp.org) .

Learn step by step:

• Related: Medicare Advantage vs. Medigap

Sources

1. Centers for Medicare & Medicaid Services. How much does Medicare drug coverage cost? Medicare.gov. https://www.medicare.gov/health-drug-plans/part-d/basics/costs. Accessed October 29, 2026.
2. Centers for Medicare & Medicaid Services. Costs (Part D out-of-pocket limit, 2026). Medicare.gov. https://www.medicare.gov/basics/costs/medicare-costs. Accessed October 29, 2026.
3. Centers for Medicare & Medicaid Services. Annual release of Part D national average bid amount (CY 2027), July 28, 2026. https://www.cms.gov/files/document/july-28-2026-parts-c-d-announcement.pdf. Accessed October 29, 2026 (search-index text of the PDF; reviewer to open).

Disclaimer

This article is for general education only and is not medical, legal, or financial advice. We do not sell, endorse, or recommend any insurance plan or company. Talk to your doctor, a licensed attorney, or a SHIP counselor (Medicare) about your situation. In an emergency, call 911.

Attribution

Portions of this page are adapted from "HowToLiveBetter" (高性价比人生指南) by eternity4719, https://github.com/eternity4719/HowToLiveBetter, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Changes: adapted and rewritten for the U.S. context (not a direct translation), and re-sourced to U.S. official guidance. The source chapter on China's health insurance (ch. 24) was not used; all Medicare content is written from scratch.