Medicare Part D

Same Pill, Different Counter? Check Your Part D Pharmacy Tier

KIHEI, Hawaii — You picked up a prescription at the drugstore near the beach last month. This month, a friend fills the same medication at a shop a few miles inland — and pays a different amount. Same drug, same dose, same insurance card. What gives?

The answer usually comes down to something called a pharmacy network. Every Medicare Part D drug plan — whether it's a stand-alone Part D plan or built into a Medicare Advantage plan — has one. And where a pharmacy sits inside that network can change what you owe at the counter.

What a Part D pharmacy network actually is

A pharmacy network is simply the list of drugstores a Part D plan has contracts with. When you fill a prescription at a network pharmacy, the plan helps pay. If you go outside the network, you may pay full price with no help from the plan, except in emergencies.

Networks aren't one-size-fits-all. Two plans sold in Maui County can have very different lists of participating pharmacies — including chains, independents, grocery-store counters, and mail-order services.

Preferred vs. standard: the tier that changes your bill

Inside the network, most plans split pharmacies into two groups:

• Preferred pharmacies — the plan has negotiated lower cost-sharing here. You typically pay less out of pocket.
• Standard (non-preferred) pharmacies — still in-network, still covered, but your share of the cost is usually higher.

That's why the same prescription can cost more across town. Both pharmacies are "in-network," but only one is preferred under your plan. Neither pharmacy is doing anything wrong — the difference is written into the plan's contracts.

Where mail order fits in

Most Part D plans also offer a mail-order pharmacy. It's designed for maintenance drugs — think blood pressure, cholesterol, or diabetes medications you refill every month. Plans often let you order a 90-day supply through the mail, which can mean fewer trips and, depending on the plan, different cost-sharing than a retail counter.

Mail order isn't automatic. You usually have to sign up, and it may not be the right fit for short-term prescriptions like antibiotics.

Why this matters in 2027

Under CMS Part D rules, your out-of-pocket drug spending is capped at $2,100 in 2026 and $2,400 in 2027. The maximum allowable plan deductible is $615 in 2026 and $700 in 2027. The old "donut hole" coverage gap is gone — as of 2025, Part D has just three phases (deductible, initial coverage, and catastrophic).

There's also the Medicare Prescription Payment Plan, an optional program that lets you spread your drug costs across the year in monthly payments instead of paying a big amount at the pharmacy.

None of that changes the fact that where you fill a prescription still affects what you pay along the way to that cap.

How to check before you fill

Kihei is in Maui County, where Part D plans are sold both as stand-alone drug plans and inside Medicare Advantage plans. Before you walk up to any counter — or set up mail order — here's how to see how a pharmacy is classified under your plan:

1. Use the Medicare Plan Finder at medicare.gov. Enter your ZIP code and your drug list. The tool shows estimated costs at specific pharmacies under each plan. 2. Call the number on the back of your plan ID card. Ask whether a specific pharmacy is preferred, standard, or out-of-network for your plan year. 3. Check your plan's pharmacy directory, usually available on the plan's website or by mail on request. 4. Contact Hawaii SHIP (the State Health Insurance Assistance Program) for free, unbiased help understanding your options.

If you're weighing a plan change, remember the Annual Enrollment Period runs October 15 through December 7 each year, and Medicare Advantage Open Enrollment runs January 1 through March 31.