Medicare Part D

Two ways to get Medicare drug coverage in Goose Creek: how the structures differ

Goose Creek, S.C. — If you take even one prescription, Medicare gives you two very different ways to pay for it. You can pair Original Medicare with a stand-alone Part D drug plan, or you can join a Medicare Advantage plan that has drug coverage built in. Both roads lead to the same 2026 program protections, but they work differently day to day — and moving from one to the other changes more than just your pharmacy card.

Goose Creek is in Berkeley County, where both stand-alone Part D plans and Medicare Advantage plans with drug coverage are sold. Here is what actually changes when you pick one path or switch between them.

The two structures, side by side

A stand-alone Part D plan (often called a PDP) is a drug-only plan. You keep Original Medicare — Parts A and B — for hospital and doctor visits, and the Part D plan handles prescriptions at the pharmacy. Many people also add a Medigap (Medicare Supplement) policy to help with Part A and Part B cost-sharing.

A Medicare Advantage plan with drug coverage (called an MAPD) replaces the way Original Medicare pays your claims. One private plan covers hospital, medical, and drugs, usually through a network of doctors and hospitals. You still pay your Part B premium, and the plan sets its own copays, referrals, and prior authorization rules.

Same drug program, different wrapping. That is the key idea.

What is the same in 2026

No matter which path you choose, the Part D rules built into your coverage are the same:

• The annual out-of-pocket cap on covered drugs is $2,100 in 2026. Once you hit it, you pay $0 for the rest of the year on covered prescriptions.
• The Part D deductible cannot be more than $615. Plans can set it lower, but not higher.
• The coverage gap ("donut hole") is gone, replaced in 2025 by a simpler three-phase design.
• The Medicare Prescription Payment Plan is available on request, letting you spread your drug costs into monthly installments instead of paying big amounts at the counter.

These are federal rules from CMS, so they follow you whether your drug plan is stand-alone or inside an Advantage plan.

What changes when you move between paths

This is where people get surprised. Switching drug plans is not just a pharmacy decision.

Moving from Original Medicare + PDP into Medicare Advantage: Your medical coverage changes too. You will use the Advantage plan's network and rules for doctors, hospitals, and specialists — not Original Medicare's. If you have a Medigap policy, it will no longer pay anything while you are on an Advantage plan, and dropping it can affect your ability to buy one back later at the same price. In South Carolina, guaranteed-issue rights for Medigap are limited outside specific windows.

Moving from Medicare Advantage back to Original Medicare + PDP: You return to the standard Medicare network (any provider that accepts Medicare), and you will likely want a stand-alone Part D plan to avoid a late-enrollment penalty. You can apply for Medigap, but outside your initial Medigap open enrollment or a guaranteed-issue situation, insurers in South Carolina can use medical underwriting.

Switching from one PDP to another, or one MAPD to another: Simpler. Your drug list (formulary), preferred pharmacies, and any prior authorization requirements can all change, so it is worth checking that your specific prescriptions are covered before the new plan starts.

When you can make the change

Two main windows matter for people in Goose Creek:

• Annual Enrollment Period: Oct. 15 – Dec. 7. Anyone with Medicare can join, drop, or switch a Part D plan or Medicare Advantage plan for a Jan. 1 start.
• Medicare Advantage Open Enrollment Period: Jan. 1 – March 31. If you are already in an Advantage plan, you can switch to a different Advantage plan or return to Original Medicare (and pick up a stand-alone Part D plan). You cannot use this window to go from Original Medicare into Advantage.

Special Enrollment Periods may also apply if you move, lose other coverage, or qualify for Extra Help.

A note on higher-income households

If your income is above $109,000 as a single filer (or $218,000 married filing jointly) on your 2024 tax return, expect an IRMAA surcharge on your Part B and Part D premiums in 2026. IRMAA follows you on both paths — it is based on income, not on which type of plan you pick.

How to compare without guessing

The Plan Finder at medicare.gov lets you enter your prescriptions and preferred pharmacies and see how each Part D plan and Medicare Advantage plan in Berkeley County would handle them. That is the single most useful step before making a change, because two plans with similar premiums can treat the same drug very differently.