Most people turning 65 in the Kansas City area spend plenty of time thinking about Medicare Supplement vs. Medicare Advantage and almost no time thinking about Part D drug coverage.

That is backwards.

A Part D plan can look inexpensive on paper and still be the wrong fit for your medications, your pharmacy, or your budget. I have seen people choose the lowest-premium drug plan they can find, only to realize later that one of their medications is on a high tier, requires prior authorization, or is much cheaper at a different pharmacy two miles away.

If you want to compare Part D plans the right way, here is what actually matters.

What Is Medicare Part D?

Part D is Medicare prescription drug coverage. It is offered by private insurance companies approved by Medicare.

If you stay on Original Medicare, you usually get Part D through a standalone drug plan. If you choose a Medicare Advantage plan, drug coverage is usually built into the plan instead. Medicare allows you to join a standalone Part D plan if you have Part A and/or Part B and live in the plan’s service area.

Even if you do not take many prescriptions right now, going without Part D or other creditable drug coverage for 63 days or more after you are eligible can trigger a permanent late enrollment penalty if you sign up later.

Why the Cheapest Medicare Drug Plan Is Often Not the Cheapest Overall

The monthly premium matters, but it is only one part of the equation.

Part D plans can differ in five ways that change your real cost:

Two plans can both say they cover your medication while producing very different costs at the pharmacy counter. One may place a drug on a preferred tier. Another may cover the same drug on a higher tier with a bigger copay. That difference adds up quickly over a full year.

What Kansas City Residents Should Compare First

When I review Part D plans for clients in Blue Springs, Independence, Lee’s Summit, and across the Kansas City metro, I start with the same four questions every time.

1. Are all of your medications on the formulary?

Every Part D plan has its own drug list, called a formulary. Medicare requires plans to cover a broad range of drugs, but not every plan covers every drug the same way.

If one of your medications is not on the formulary, the premium no longer matters. You are already starting from the wrong plan.

2. What pharmacy are you actually going to use?

This is where people get surprised.

Medicare drug plans often have preferred in-network pharmacies that charge less than standard in-network pharmacies. In some plans, using the wrong pharmacy can raise your out-of-pocket costs even if the drug itself is covered.

That matters in the Kansas City area because many people bounce between CVS, Walgreens, Hy-Vee, Costco, grocery pharmacies, mail order, and local independent pharmacies depending on where they live and shop. Your plan may treat those pharmacies very differently.

3. Is there a deductible?

Some Part D plans have no deductible. Others do. A deductible is not automatically bad, but you need to know how it affects your medications.

If you take only one or two inexpensive generics, a higher-deductible plan with a lower premium may still work fine. If you take several brand-name medications, the wrong deductible structure can make January and February much more expensive than you expected.

4. Are there utilization rules?

Some plans require prior authorization. Some use step therapy. Some apply quantity limits.

None of those rules automatically disqualify a plan, but they do create friction. If you already know a medication is essential and stable, it makes little sense to pick a plan that is likely to slow you down at the pharmacy.

How the Part D Out-of-Pocket Cap Changes the Math

Medicare drug coverage now has a real annual out-of-pocket cap. In 2026, once your out-of-pocket spending on covered Part D drugs reaches $2,100, you move into catastrophic coverage and stop paying out of pocket for covered drugs for the rest of the calendar year.

That is a major improvement for people with expensive medications, but it does not mean every Part D plan is interchangeable. You can still overpay on the way to that cap if you choose a plan with a weak formulary fit or the wrong pharmacy network.

In other words, the cap protects you from the worst-case scenario. It does not eliminate the need to shop carefully.

Do You Need Part D If You Do Not Take Any Medications?

In many cases, yes.

If you go 63 days or more without Part D or other creditable prescription drug coverage after you become eligible, Medicare can charge a late enrollment penalty later. That penalty is generally 1% of the national base beneficiary premium for every full month you went without creditable coverage, and it is added to your premium as long as you have Part D.

If you have drug coverage from an employer, union, TRICARE, or the VA, the key question is whether that coverage is creditable. Your current plan should be able to tell you.

Should Kansas City Residents Review Their Part D Plan Every Year?

Absolutely.

Part D is not a set-it-and-forget-it decision. Formularies change. Pharmacy pricing changes. Preferred pharmacy relationships change. Your medications change. The plan that fit you well last year may not be the best fit next year.

This is especially true for people with diabetes, heart conditions, autoimmune disorders, cancer history, or any condition where one formulary change can materially change monthly costs.

What About Extra Help and Other Cost Assistance?

If your income and resources are limited, Medicare’s Extra Help program can lower Part D premiums, deductibles, and other drug costs. Some people qualify automatically. Others need to apply.

I bring this up because many people assume they earn too much and never check. It is worth checking.

The Right Way to Compare Part D Plans

The cleanest way to compare Part D plans is to build the comparison around your real life:

That is the difference between shopping and guessing.

If you are turning 65 or reassessing your coverage during the Annual Enrollment Period, I can review your drug list alongside your Medicare Supplement or Medicare Advantage options and show you where the real costs are likely to land.

Frequently Asked Questions

Is the lowest-premium Part D plan usually the best choice?

No. A low premium can still leave you with higher total costs if your drugs are on expensive tiers, your pharmacy is not preferred, or the plan applies utilization rules that delay access.

Can I have Part D with Original Medicare?

Yes. If you have Original Medicare, you usually get prescription drug coverage through a standalone Medicare drug plan.

Does Medicare Advantage include Part D?

Usually, yes. Most Medicare Advantage plans include drug coverage, which means you generally do not join a separate standalone Part D plan.

How often should I review my Medicare drug plan?

At least once a year. Part D plans can change formularies, pharmacy networks, and cost-sharing from one year to the next.