Medicare Part D

Preferred or standard pharmacy? Why Part D prices shift across town

EL MONTE, Calif. — Two neighbors on the same Medicare Part D plan can walk into two different pharmacies, hand over the same prescription, and pay two different prices. It's not a mistake at the register. It's how Part D pharmacy networks are built — and knowing the difference between a "preferred" pharmacy, a "standard" pharmacy, and mail order can change what you spend at the counter all year.

What a Part D pharmacy network actually is

A Part D plan — whether it's a stand-alone drug plan or the drug coverage built into a Medicare Advantage plan — contracts with a list of pharmacies. That list is the plan's network. If you fill a prescription at a pharmacy in the network, the plan helps pay. If you fill it somewhere outside the network, you may pay full price.

El Monte is in Los Angeles County, where Medicare beneficiaries have a wide range of Part D options to choose from. That also means a wide range of pharmacy networks, because each plan builds its own.

Preferred vs. standard: same network, different price

Here's where it gets confusing. Inside a single network, pharmacies are usually sorted into two levels:

• Preferred pharmacies. The plan has negotiated lower cost-sharing at these locations. Your copay or coinsurance for a covered drug is typically less here.
• Standard pharmacies. Still in the network, still covered — but your share of the cost is generally higher than at a preferred location.

That's why the same pink pill, on the same plan, can cost one amount at a pharmacy on Valley Boulevard and a different amount at one a few miles away. Neither pharmacy is doing anything wrong. They're just at different tiers in that plan's contract.

Where mail order fits in

Most Part D plans also offer a mail-order pharmacy for medications you take regularly — think blood pressure, cholesterol, or diabetes drugs. Mail order usually ships a 90-day supply at a time, which can mean fewer trips and, depending on the plan, different cost-sharing than a retail pharmacy.

Mail order isn't automatic. You have to sign up, and it works best for stable, long-term prescriptions — not a short course of antibiotics you need today.

How this fits with the 2027 rules

No matter which pharmacy you use, the same program-level protections apply in 2027:

• Part D out-of-pocket spending on covered drugs is capped at $2,400 for the year.
• The maximum Part D deductible a plan can charge is $700.
• The old coverage gap ("donut hole") is gone as of 2025 — Part D now has three phases instead of four.
• The Medicare Prescription Payment Plan lets you spread your drug costs across the year in monthly bills instead of paying big amounts at the pharmacy counter. It's optional and free to join.

Where you fill your prescription can change what you pay on a given day, but it can't change these overall guardrails.

How to check before you fill

You don't have to guess. A few ways to see how a pharmacy is classified under a plan:

1. Use the Medicare Plan Finder at Medicare.gov. When you compare Part D or Medicare Advantage plans, you can enter your drugs and your preferred pharmacies. The tool will show estimated costs at each pharmacy, including whether it's preferred, standard, or mail order. 2. Read the plan's pharmacy directory. Every plan publishes one, and it lists which pharmacies are in-network and at which tier. 3. Call the plan directly. The member services number is on your card. 4. Ask the pharmacy. Staff at the counter can often tell you whether they're preferred or standard for a given plan.

If you'd rather talk to a neutral human, California's State Health Insurance Assistance Program (SHIP) — known here as HICAP — offers free, unbiased counseling to people on Medicare. You can also call 1-800-MEDICARE (1-800-633-4227), 24/7.

When you can make changes

If you look at your pharmacy options and realize your plan doesn't line up with where you actually shop, you have set times to switch:

• Annual Enrollment Period: October 15 – December 7. You can join, switch, or drop a Part D or Medicare Advantage plan. Changes start January 1.
• Medicare Advantage Open Enrollment: January 1 – March 31. If you're already in a Medicare Advantage plan, you can switch to another Medicare Advantage plan or return to Original Medicare (and add a stand-alone Part D plan).

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