Medicare Part D: choosing a prescription drug plan

Medicare Part D is prescription drug coverage, and it’s one of the most personal choices you’ll make in Medicare. The plan that’s a bargain for your neighbor could be an expensive mistake for you, because it all comes down to the specific medications you take. Here’s how Part D works and how to choose well.

What Part D is and how you get it

Part D is optional, private prescription drug coverage that works with Medicare. You can get it two ways:

• As a standalone Part D plan that you pair with Original Medicare (often alongside a Medigap Supplement).
• Built into a Medicare Advantage plan, where drug coverage is usually bundled in.

Even if you take few or no prescriptions today, it’s worth having creditable drug coverage in place. Going without it for too long can trigger a permanent late-enrollment penalty on your Part D premium down the road. Staying continuously covered is the simplest way to avoid that.

Formularies: the heart of the plan

Every Part D plan has a formulary, which is simply the list of drugs it covers. This is the single most important thing to check, because formularies differ from plan to plan.

If one of your medications isn’t on a plan’s formulary, that plan may not help pay for it at all. So before looking at premiums, the real question is: does this plan cover my drugs? A plan with a low monthly premium that doesn’t cover your medication is no bargain.

Formularies can also change from year to year. A drug that’s covered this year might move or drop off next year, which is one reason an annual review matters (more on that below).

Tiers and what they mean for cost

Within a formulary, drugs are sorted into tiers, and the tier determines your share of the cost.

• Lower tiers usually hold preferred generics and cost you the least.
• Higher tiers hold brand-name and specialty drugs and cost more.

Two plans can both cover the same medication but place it on different tiers, which changes what you pay. That’s why comparing plans drug by drug beats comparing premiums alone. It’s also why we ask for your full medication list, including dosages, when we help you shop.

Where you fill prescriptions matters too. Many plans have preferred pharmacies that cost less than standard ones. In smaller Mountain West towns, it’s worth checking whether the pharmacy you actually use, or mail-order delivery, gives you the better price under a given plan.

How coverage phases work

Part D coverage is structured in phases over the course of the year. You don’t need to memorize the mechanics, but the general shape is helpful to understand:

1. Deductible phase. Some plans start with a deductible you pay before coverage kicks in; others have no deductible.
2. Initial coverage phase. You and the plan share costs according to your tiers.
3. Later phases. After your spending reaches certain thresholds, your cost-sharing changes again, and there is protection built in for people with very high drug costs.

The exact dollar thresholds are set by Medicare and change every year, so we won’t quote figures here. What matters is that your total yearly cost depends on all these phases together, not just your monthly premium. Two people on the same plan can have very different out-of-pocket totals depending on which drugs they take and when.

Why matching your specific prescriptions matters

This is the point we come back to again and again: the right Part D plan is the one that covers your drugs at the lowest total cost. To find it, you compare, for each plan you’re considering:

• Whether every one of your medications is on the formulary.
• What tier each drug sits in.
• The plan’s premium, deductible, and copays.
• Whether your pharmacy is preferred.

Add all of that up across a full year, and the “cheapest” plan on paper often isn’t the cheapest in practice. This is tedious to do by hand, which is exactly where an agent earns their keep.

Review your plan every year

Here’s the habit that saves people the most money: review your Part D plan each fall during the Annual Enrollment Period (commonly October 15 through December 7). Three things can change between years:

• The plan’s formulary and tiers.
• The plan’s premiums and copays.
• Your own prescriptions, if a doctor adds, drops, or changes a medication.

Any one of those can turn last year’s great plan into this year’s overpriced one. A quick annual check-in makes sure you’re still in the best fit, and changes made in the fall take effect January 1.

Why compare with an independent agent

Because Port Bay is independent, we compare Part D options across the carriers we represent and run them against your actual medication list, not a generic estimate. There’s no cost to you for the comparison, and you get a real person to call each year at review time. That yearly relationship is where the savings add up.

Talk it through with Port Bay

Don’t guess at your drug plan, and don’t let it run on autopilot. Call (866) 827-4241 for a free, no-pressure review. Share your prescriptions, and we’ll help you find the Part D coverage that fits them best, this year and next.