How to Choose a Medicare Part D Plan When You Manage Your Own Medications

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Why I stopped comparing premiums

The first year I chose a Part D plan on my own, I picked the cheapest monthly premium. I was a nurse for thirty-one years and I still got it wrong, which tells you something about how this is presented.

That plan cost me $11.40 a month and about $780 more over the year than the plan I switched to the following January, which cost $29 a month. The premium was never the number that mattered. The total was.

Here is the process I use now. It takes about an hour once a year, and it has saved me real money every time.

Step 1: Write down every medication before you open a single website

Do this on paper first. Every prescription, the dose, and how often you take it. Include anything you take occasionally — the antibiotic you get twice a year counts.

Also write down the pharmacy you actually use, not the one you’d prefer. In-network matters more than convenience here, but you need to know your starting point.

I keep this list on an index card in my wallet. Twice it has been genuinely useful in an emergency room.

Step 2: Enter it into the plan finder

Go to Medicare’s plan finder at medicare.gov and enter every drug, dose and frequency. Then enter your pharmacy.

The tool estimates your total annual cost for each plan available where you live. That estimate — not the premium — is what you’re comparing.

If you’d rather not do it alone, your local SHIP counsellor will walk through it with you for free. There’s no sales pitch, which is the part I appreciate.

Step 3: Compare total annual cost, not the monthly premium

Add it up properly: twelve months of premium, plus the annual deductible, plus your expected copays for the year. The plan finder does this, but check its arithmetic against your own list.

Here’s the table I fill in. Copy it onto paper or into a notes app:

The last column is the only one that decides anything. I’ve watched the cheapest premium lose by $600.

Step 4: Confirm your pharmacy is in-network

A plan can cover your drugs and still be a bad deal if your pharmacy isn’t in its network — and networks include “preferred” pharmacies that cost you less than standard ones.

Check your actual store, by name. If you use a small independent pharmacy, check it specifically; those change network status most often.

Step 5: Confirm the tier for each drug

Plans sort drugs into tiers, and the tier sets your copay. The same drug can sit in tier 2 on one plan and tier 4 on another — a difference of ten or forty dollars a refill.

The plan finder shows tier placement. Write it next to each drug on your list. If one of your medications lands on a high tier in every plan, ask your doctor whether a therapeutic equivalent sits lower. I did exactly that with one of mine and it cut the copay by roughly two-thirds.

Step 6: Re-run the whole thing every Open Enrollment

Formularies change. Tiers move. Pharmacies drop out. A plan that was right for you last year can quietly become the wrong one, and it will auto-renew without telling you.

Open Enrollment runs October 15 to December 7. I put it in my calendar in September. One hour a year, and it’s the highest-paid hour of my financial year.

The out-of-pocket cap changed — and it changes the maths

There is now an annual ceiling on what you pay out of pocket for Part D drugs. Once you reach it, covered prescriptions cost you nothing for the rest of the year. The figure was $2,000 in 2025 and is adjusted annually, so look up the current number at medicare.gov rather than trusting any article — including this one.

Two things follow. First, the old “donut hole” your neighbour remembers from a decade ago no longer works the way it did; the coverage gap has been restructured. Second, if you take an expensive medication, ask the plan whether you can spread your costs across the year in monthly instalments instead of paying a large sum at the counter in February.

For anyone on a fixed income, a hard ceiling is the most useful change to Part D in years. It makes the worst case knowable — and when you live alone, a knowable worst case is worth a great deal.

Three mistakes I watch people make

Assuming last year’s plan is still the right one. It auto-renews in silence. Formularies move every January, and a drug that was cheap last year can quietly become expensive.

Comparing premiums only. I did exactly this and it cost me $780. The premium is the smallest and least informative number on the comparison page.

Forgetting the medications you take occasionally. The antibiotic you get twice a year, the rescue inhaler, the cream you use every winter. They’re on the formulary too — and if they aren’t covered, you’ll find out standing at the pharmacy counter.

What I keep on hand while doing this

Three things, none expensive, and the first one is the only reason the rest works:

• A large weekly pill organizer — I use mine as the physical source of truth when I build the medication list in Step 1. Reading doses off the actual container beats trying to remember them.
• An automatic pill dispenser — worth it once your schedule gets complicated, and it makes the “how often” column accurate.
• A simple medication list notepad — I keep one copy at home and one in my bag.

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Compare Part D options

Once your list is ready, you can compare current Part D plans and check which ones cover your specific medications at our Part D comparison section. If you’re also sorting out the daily side of managing several prescriptions on your own, I’ve written about that separately in managing your medicines alone.

Some of the links on this page are partner links, and I may earn a commission if you purchase through them — at no extra cost to you.