Medicare & senior health
Part D prescription drug plans
Drug coverage is the part of Medicare people get wrong most often, because the plan with the lowest premium is almost never the plan with the lowest total cost. The comparison that matters is your actual medication list at your actual pharmacy.
Worth considering if
- Anyone on Original Medicare who takes prescription medication
- Anyone on Original Medicare who takes none — as penalty protection
- People whose drug list changed during the year
- People whose plan sent an Annual Notice of Change moving a drug to a higher tier
Watch out for
- Formularies change every January 1 — your drug can move tiers or drop off
- Pharmacy networks are tiered; the same drug can cost more at the wrong counter
- A cheap premium with the wrong formulary is the most expensive mistake in Part D
- Going without creditable coverage triggers a permanent late-enrollment penalty
- Prior authorisation and step therapy apply to more drugs than people expect
How the money flows in a Part D plan
A Part D plan has four moving parts: the monthly premium, an annual deductible that some plans charge and some do not, a tiered copay or coinsurance structure for each drug on the formulary, and an annual cap on what you can spend out of pocket on covered drugs. Once you hit that cap, your covered prescriptions cost you nothing for the rest of the plan year.
The cap is a genuinely significant change from how Part D worked historically. It replaced the old catastrophic-coverage arrangement where beneficiaries kept paying a percentage indefinitely, and it means a person on high-cost specialty medication now has a knowable worst case. It also means the shape of the right plan changed: for someone on an expensive drug, the plan that reaches the cap most efficiently can beat a plan with a lower premium.
The late-enrollment penalty, and how to avoid it
If you go 63 days or more without creditable prescription drug coverage after your Initial Enrollment Period ends, Medicare adds a penalty to your Part D premium. It is calculated from the number of months you went uncovered, and once it attaches it generally stays for as long as you have Part D coverage. It is small each month and large over a retirement.
The frustrating part is how easy it is to trigger accidentally: someone takes no medication at 65, sees no reason to buy drug coverage, and enrolls four years later when they finally need it. Creditable employer coverage protects you; nothing protects you. If you take no prescriptions today, the right move is usually the least expensive compliant plan in your area, held purely as penalty protection.
What changes every January
All of it arrives in the Annual Notice of Change your plan mails each autumn, in a document most people never open. That envelope is the single most useful piece of mail you receive all year, and re-running your drug list against it is the reason to do an annual review even when nothing in your life has changed.
- The formulary — drugs are added, removed, or moved between tiers
- Tier cost sharing — the same tier can carry a different copay
- The pharmacy network — preferred pharmacies are re-contracted annually
- Utilization rules — prior authorisation, quantity limits and step therapy are revisited
- The premium and deductible for the plan you are already in
Frequently asked questions
Do I need Part D if I take no medication?
Almost always yes, as insurance against the late-enrollment penalty rather than as drug coverage. Going 63 days or more without creditable coverage adds a permanent surcharge to your Part D premium later. A low-cost compliant plan today is cheaper than the penalty applied for the rest of your life.
Is Part D included in a Medicare Advantage plan?
Usually. Most Medicare Advantage plans are MAPD plans with drug coverage built in, and if you enroll in one you should not also buy a standalone Part D plan — doing so can disenrol you from the Advantage plan. If you are on Original Medicare with a Medigap policy, you buy a standalone Part D plan separately.
What is the Part D out-of-pocket cap?
It is an annual ceiling on what you pay for covered prescription drugs. Once your out-of-pocket spending reaches the cap for the plan year, your covered drugs cost you nothing for the remainder of that year. The amount is set annually — ask us for the current figure, or check Medicare.gov.
Can I change my Part D plan mid-year?
Generally only during the Annual Enrollment Period from October 15 to December 7, unless you qualify for a Special Enrollment Period — moving, losing other creditable coverage, entering a care facility, or qualifying for Extra Help among them. If your circumstances changed, tell us; there may be a window you do not know about.
What is Extra Help?
Extra Help, also called the Low Income Subsidy, reduces or eliminates Part D premiums, deductibles and copays for people under certain income and asset limits. Many people who qualify never apply because nobody tells them it exists. We check eligibility as part of every drug review at no charge.
On the figures above. Figures reflect published Medicare amounts for the plan year shown and are provided for orientation only. Carrier premiums, deductibles and networks vary by county and change annually — confirm current numbers before you enroll.
How we help
The services that go with this.
-
Prescription drug cost review
Your actual drug list, run against every plan in your county, at your pharmacy.
How it works -
Annual coverage review
Your plan changes every January. We re-check it every October, before it costs you.
How it works -
Medicare enrollment assistance
Step-by-step help getting enrolled in the right Medicare arrangement, at no cost to you.
How it works
Related coverage
Worth reading next.
-
Medicare Advantage (Part C)
A private, all-in-one alternative to Original Medicare — often with a $0 premium, usually with drug coverage built in, always with a network.
Read the guide -
Medicare Supplement (Medigap)
A Medigap policy pays the deductibles and coinsurance Original Medicare leaves on your side of the ledger.
Read the guide -
Dental, vision & hearing
Original Medicare covers almost none of it — not cleanings, not fillings, not dentures, not glasses, not hearing aids.
Read the guide