What Medicare Part D Actually Costs in 2027: A $700 Deductible, a $2,400 Ceiling, and Why Both Jumped

There are two numbers in Medicare Part D that decide most of what you will actually spend next year. For 2027 both of them went up, and one of them went up by nearly 14 percent.

The standard deductible rises to $700, from $615. The annual out-of-pocket ceiling — the point where your covered drug costs stop for the year — rises to $2,400, from $2,100. Both figures come from CMS’s own 2027 Rate Announcement, Table V-2.

Those increases are not a policy choice anyone made this year, and understanding why is the difference between being annoyed and being prepared.

The short answer: you pay the first $700 of covered drug costs yourself, then 25 percent of the cost of your prescriptions until your own spending reaches $2,400, after which you pay nothing for covered Part D drugs for the rest of the year. The old coverage gap is gone. The $700 is a maximum a plan may charge, not a price every plan charges, and your premium is separate from all of it.

The 2027 numbers, in one table

Everything below comes from Attachment V of the CY 2027 Rate Announcement, which is where CMS publishes the defined standard benefit parameters each spring.

Two things that table does not include, because they are set elsewhere and often confused with it. Your monthly premium is a plan-by-plan figure, not a federal parameter — we covered what moved it for 2027 in why your 2027 Part D premium jumped. And the income-related surcharge high earners pay on top of the premium is announced separately each autumn.

Why the deductible rose almost 14 percent

This is the part worth understanding, because it tells you what to expect in 2028 as well.

The Part D deductible and out-of-pocket threshold are not reviewed annually and set by judgement. They are indexed. Section 1860D-2(b)(6) of the Social Security Act requires CMS to calculate an Annual Percentage Increase based on “the annual percentage increase in average per capita aggregate expenditures for covered Part D drugs in the United States for Part D eligible individuals.” Whatever that growth rate turns out to be, the deductible moves with it.

For 2027 that index came to 13.65 percent — an annual percentage trend of 9.37 percent for 2026 plus a 3.92 percent correction for prior-year revisions, compounded. CMS then applies it mechanically: the 2026 deductible of $615 multiplied by the index, rounded to the nearest $5, gives $700. The 2026 threshold of $2,100 multiplied by the same index, rounded to the nearest $50, gives $2,400.

So the deductible rose because national spending on Part D drugs rose, by a lot. The index is a thermometer, not a thermostat.

Somebody said as much to CMS during the comment period. A commenter wrote that the indexed parameters were “resulting in increases in the deductible and other benefit thresholds that may affect beneficiary affordability,” and asked CMS to use whatever flexibility it had to smooth the calculation.

CMS’s answer, in the Rate Announcement itself: the methodology “is specified in section 1860D-2(b)(6) of the Act,” and “as such, CMS does not have flexibility to change the API calculation methodology in this Rate Announcement.” The agency also noted it had just written its longstanding methodology into regulation in the CY 2027 final rule, for transparency and predictability.

That is an unusually plain statement, and it is useful to you in one specific way: there is nothing to appeal here, and no plan to shop that gets you a lower federal deductible. What you can shop is a plan that charges less than the maximum, which is the next-but-one section.

Two indexes, pulling apart

Here is something you will not see in a press release, and it comes straight out of putting two CMS tables side by side.

The deductible and the out-of-pocket threshold are indexed to Part D drug spending growth — 13.65 percent for 2027. But the copayment caps that protect people with the low-income subsidy are indexed to something else entirely. Section 1860D-14(a)(4) of the Act ties those to the annual percentage increase in the Consumer Price Index for the twelve months ending in September. For 2027 that figure was 3.00 percent — a September trend of 2.31 percent plus a 0.67 percent prior-year revision.

So in the same document, in the same plan year, the amount a middle-income beneficiary must pay before coverage begins rose by 13.65 percent, while the amount a low-income beneficiary pays per prescription rose by 3.00 percent.

Neither index is wrong. They were written into law at different times for different purposes, and the lower one is plainly protective of the people it covers. But the arithmetic has a consequence that compounds: the gap between the protected copay and the unprotected deductible widens every year that drug spending grows faster than consumer prices. Over a decade at these rates, that is not a rounding difference.

The practical reading, if you are near the Extra Help income limits, is that qualifying is worth more each year than it was the year before. We go through the thresholds in Medicare Extra Help and the income limits, and the related state programmes in Medicare Savings Programs in Texas. People who assume they earn too much to qualify are frequently wrong, and the cost of being wrong goes up annually.

How a year on Part D actually unfolds

The structure has been simpler since 2025 than it was for the fifteen years before, and a lot of people still carry the old version around in their heads. There are three phases, not four.

1. Deductible phase. You pay 100 percent of the negotiated cost of your drugs until you have paid $700. If your plan sets a lower deductible, this phase is shorter or does not exist.
2. Initial coverage phase. You pay 25 percent of the cost of each prescription. The plan pays the rest. This continues until your own out-of-pocket spending for the year reaches $2,400.
3. Catastrophic phase. You pay nothing for covered Part D drugs for the remainder of the calendar year.

The coverage gap — the “donut hole,” where you once paid a much larger share in the middle of the year — was eliminated by the Inflation Reduction Act and does not exist in 2027. If someone describes one to you, they are describing a plan year that ended two years ago.

In practice the 25 percent phase is where most households spend most of their money, and it is the phase your plan’s tier structure acts on, because 25 percent of a cheaper negotiated price is a smaller number. That is why the formulary matters more than the deductible for most people, and why we keep saying the same thing about checking your drugs rather than comparing premiums.

One more mechanical note. Everything resets on January 1. A December prescription that would have been free under the catastrophic phase is charged at the deductible rate if you fill it on January 2 instead. For an expensive medication that single choice of date is worth real money, in whichever direction suits you.

$700 is a ceiling, not a price

This is the most commonly misread thing about the deductible, and it is the one place where shopping genuinely changes your number.

$700 is the deductible of the defined standard benefit — the benchmark design against which plans are measured. A plan may charge less. Plenty do: you will find Part D and Medicare Advantage drug benefits with a deductible of a few hundred dollars, and some with no deductible at all. What a plan cannot do is charge more than $700, or make its overall benefit less generous than the standard one.

A lower deductible is not free. It is paid for in the premium, in the tier structure, in the formulary, or in all three. Which means the comparison you actually want is not “which plan has the lowest deductible” but “what does my whole year cost under each plan” — premium plus deductible plus the 25 percent share on my specific drugs at my specific pharmacy.

That total can invert the ranking completely. A plan with a $0 deductible and a higher premium wins for someone on three expensive brand-name drugs and loses badly for someone on two cheap generics. There is no plan that is better in general. There is only the plan that is better for your list.

And where you fill changes the answer again, because your 25 percent is 25 percent of a price that varies by pharmacy tier. We set that out in how Part D pharmacy networks work in Houston. The Plan Finder walkthrough in how to use Medicare Plan Finder for 2027 shows you how to get a full-year total rather than a monthly one.

What counts toward the $2,400 — and what does not

The ceiling only works if you know what moves you toward it. Several things that feel like drug costs do not count.

Counts: what you pay for covered Part D drugs at a network pharmacy — your deductible payments and your 25 percent share. That is the core of it, and for most people it is all of it.

Does not count:

• Your monthly premium. Premiums are the price of having the plan, not spending within it. A $70-a-month plan does not put $840 toward your ceiling.
• Drugs your plan does not cover. A non-formulary medication you simply pay for yourself does not count unless you win a formulary exception and the plan covers it.
• Drugs you buy outside the plan. This is the trap in using a cash price or a discount card: it can save you money this month and leave your ceiling untouched. On a $4 generic that is fine. On an expensive drug it can cost you far more over a year than it saves.
• Drugs Part D does not cover at all. Over-the-counter medicines, and categories excluded by statute.
• Part B drugs. Anything administered in a clinic or infusion centre runs through Part B, with its own rules and no $2,400 ceiling.

That last one surprises people with serious conditions most often, because the drug that dominates their year may not be a Part D drug at all.

If $2,400 in January is not possible

The ceiling is a genuine protection, and for someone on a high-cost specialty drug it can be reached in the first weeks of the year. Which is excellent news in March and a crisis in January, if $2,400 is not sitting in an account.

There is a mechanism for exactly this. The Medicare Prescription Payment Plan lets you spread your out-of-pocket drug costs across the remaining months of the calendar year in level payments, rather than paying at the counter. It does not reduce what you owe — it changes the timing, which for a fixed-income household is often the binding constraint. You have to opt in, and the sooner in the year you do it, the more months there are to spread across.

We cover how to enrol and when it helps in our guide to the Medicare Prescription Payment Plan. If you take a drug that costs more than a few hundred dollars a month, it is worth deciding about this in December rather than discovering it in February.

Two other things that genuinely reduce the bill rather than rescheduling it: Extra Help, if you qualify, which replaces this whole structure with fixed copays; and the negotiated prices now taking effect on selected drugs, which we track in Medicare drug price negotiation and what Houston beneficiaries pay.

If your income is modest: the 2027 Extra Help figures

For people with the low-income subsidy, almost none of the above applies. The deductible is $0 and the 25 percent share is replaced by fixed copayments, which CMS sets in the same table.

Those copays apply up to the out-of-pocket threshold; above it, you pay nothing. Note what the second column says: the deductible is zero in every category. Extra Help removes the $700 entirely.

The resource limits for 2027 had not been published when this article went out — CMS issues them by memorandum once the September 2026 CPI is available from the Bureau of Labor Statistics. For 2026 the limits were $18,090 for an individual and $36,100 for a married couple. If you are near those figures, apply rather than assume; the 2027 numbers will be slightly higher, not lower.

Frequently asked questions

Talk it through with someone local

The federal numbers are the same for everybody in Harris County. What differs is your drug list, your pharmacy, and which plan prices your particular combination best — and that is a calculation, not an opinion.

Bring your prescriptions with doses, the pharmacy you actually use, and your Annual Notice of Change if you have it. We will give you a full-year total for each option rather than a monthly premium, because the monthly premium is the number most likely to mislead you.

Call 832-400-6538 or email sara@wisehealthins.com, or read more about the Medicare plans and Medicare Advantage options we work with. We serve clients from North Houston and South Houston.

This article is for general information and is accurate as of October 23, 2026. It is not medical, tax or legal advice. The figures above are the federal defined standard benefit parameters; individual plan deductibles, copayments, formularies and premiums vary by plan and county, and your own plan documents govern where this article is general. Talk to a licensed agent before choosing a plan.