Part d with medigap is one of the most important coverage decisions facing Original Medicare beneficiaries. Medigap supplement plans help cover out-of-pocket costs like deductibles and coinsurance under Parts A and B. However, no Medigap plan sold after January 1, 2006 includes prescription drug coverage. That means roughly 12.2 million Americans with Medigap policies need a separate solution for medications. A standalone Part D prescription drug plan fills that gap. Understanding how part d with medigap works together can prevent costly penalties, ensure continuous drug coverage, and protect against unexpected pharmacy expenses as you age.
Why Medigap Does Not Include Drug Coverage
Congress eliminated drug coverage from new Medigap policies when Medicare Part D launched in 2006. Before that date, some older plans like H, I, and J offered limited prescription benefits. Those plans are no longer sold. Today, the 10 standardized Medigap plans — A, B, C, D, F, G, K, L, M, and N — cover hospital and medical cost-sharing only. None of them pay for prescriptions.
Plan G is currently the most popular Medigap option, covering about 39% of all policyholders. Plan F remains widely held but has been closed to new enrollees since January 2020. Regardless of which letter you choose, you will not receive drug benefits through Medigap. As a result, pairing part d with medigap is the standard approach for well-rounded Original Medicare coverage.
How Part D With Medigap Creates Complete Coverage
When you enroll in both a Medigap plan and a standalone Part D plan, you build a three-layer coverage system. Original Medicare handles hospital and medical services. Medigap covers most of the remaining cost-sharing. Part D pays for prescription drugs. This combination gives you access to virtually any doctor or hospital that accepts Medicare nationwide.
The Inflation Reduction Act made Part D significantly more valuable starting in 2025. Annual out-of-pocket drug spending is now capped at $2,000. The coverage gap, once called the “donut hole,” has been fully eliminated. Insulin costs are capped at $35 per month for all Part D enrollees. These protections mean that part d with medigap now offers stronger financial protection than ever before.
Approximately 23 million people are enrolled in standalone Part D plans nationwide. In most regions, beneficiaries can choose from roughly 14 to 15 standalone options during Open Enrollment. Insurers like UnitedHealthcare, Humana, Aetna, Cigna, and Blue Cross Blue Shield typically offer competing plans in each market. Comparing formularies, pharmacy networks, and costs each year is essential since plan details change annually.
Enrollment Timing and the Late Penalty
Signing up for Part D at the right time matters considerably. Your Initial Enrollment Period spans seven months. It starts three months before your 65th birthday month and ends three months after. Missing this window without other creditable drug coverage triggers a permanent late enrollment penalty.
The penalty equals 1% of the national base beneficiary premium multiplied by every full month you lacked coverage. For example, going 24 months without creditable coverage means a permanent surcharge added to every future premium payment. The penalty never expires. Consequently, enrolling in Part D when you first become eligible is one of the smartest financial moves a Medigap holder can make.
Each year, the Annual Open Enrollment Period runs from October 15 through December 7. During this window, you can join a new Part D plan, switch plans, or drop coverage entirely. Changes take effect January 1 of the following year. There is no lifetime limit on switching. Medicare.gov and your local SHIP counselor can help you compare options at no cost.
What Part D Covers in 2025 and Beyond
The Part D benefit now operates in three phases. First, you pay full drug costs until meeting the annual deductible — capped at $590 in 2025. After that, you enter the initial coverage phase and pay 25% coinsurance. Once your total out-of-pocket spending hits the $2,000 annual cap, you enter catastrophic coverage and owe nothing more for the rest of the year.
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| Coverage Phase | What You Pay |
|---|---|
| Deductible (up to $590 in 2025) | 100% of drug costs |
| Initial Coverage | 25% coinsurance |
| Catastrophic (after $2,000 out-of-pocket) | $0 — no cost-sharing |
Part D also introduced the Medicare Prescription Payment Plan, which spreads out-of-pocket costs into predictable monthly installments. This is particularly helpful for beneficiaries taking expensive specialty medications. Together, these protections make part d with medigap a comprehensive safety net against both medical and pharmacy expenses.
Frequently Asked Questions
Do I need Part D if my Medigap plan covers everything else?
Yes. Medigap covers hospital and doctor cost-sharing but not prescriptions. Without Part D or another creditable drug plan, you risk a permanent late enrollment penalty. Adding a standalone Part D plan is the standard way to get drug coverage alongside Medigap.
Can I use Medicare Advantage instead of pairing part d with medigap?
You can choose one path or the other, but not both at the same time. Medicare Advantage plans bundle medical and drug coverage together. If you already hold a Medigap policy, you would need to drop it before switching. Typically, you may also lose guaranteed-issue rights if you try to return to Medigap later.
When is the best time to sign up for part d with medigap?
The best time is during your Initial Enrollment Period around age 65. If you miss that window, the Annual Open Enrollment from October 15 to December 7 is your next opportunity. For instance, beneficiaries losing employer drug coverage qualify for a two-month Special Enrollment Period after that coverage ends.
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Official Sources & Resources
For verified information on Medicare regulations and consumer protection:
- Medicare.gov (Official Site): medicare.gov
- CMS (Centers for Medicare & Medicaid Services): cms.gov
- NAIC (National Association of Insurance Commissioners): naic.org
- KFF Medicare Research: kff.org/medicare
- Social Security Administration: ssa.gov
Content last reviewed May 2026. If you notice any outdated information, please contact us.