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6 Medicare Part D Rules for 2027 Everyone Over 65 Should Know About

Before you keep or switch plans, check these 2027 prescription rules that could change what you pay and when.

By Chris Lewis, CEPF , Edited by Laura Hohenstein

Updated Nov. 12, 2026

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Your Medicare drug plan deserves a fresh look this fall to be sure you make the right moves, even if you liked your coverage this year. Prescription costs can shift in ways that are easy to miss until a refill gets expensive.

For 2027 coverage, Medicare open enrollment runs from October 15 to December 7, 2026, and changes made during that period take effect Jan. 1, 2027. Part D plans are also operating under updated cost limits and drug-pricing rules that could affect your pharmacy bill.

Here are six Part D rules and costs to check before you decide whether to keep your plan or move to another one.

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Your cap may change

Medicare Part D still has an annual limit on covered out-of-pocket drug costs in 2027, but the exact dollar amount could be different from the number you remember. The Centers for Medicare & Medicaid Services set the 2027 Part D out-of-pocket cap at $2,400, compared with $2,100 for 2026.

That cap matters if you take expensive brand-name or specialty drugs. Once your qualifying out-of-pocket costs reach $2,400, you pay nothing for covered Part D drugs for the rest of 2027. Certain payments made on your behalf also count toward that limit.

The key word is covered. Premiums do not count toward the cap. Spending on drugs your plan does not cover generally does not count either, but your qualifying costs can count if the plan approves coverage through an exception or appeal.

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The deductible reset

The standard Part D deductible also resets for 2027. CMS set the 2027 standard deductible at $700, though plans could charge less or skip the deductible for some drug tiers.

That means two people with the same cap can still have very different January costs. One plan might make you meet the deductible before most drugs are covered, while another could cover common generics right away.

Check your exact drug list, not just the plan premium. A low monthly premium might look good until the deductible, copays, and coinsurance show up at the pharmacy counter.

Monthly spreading continues

The Medicare Prescription Payment Plan remains an option for 2027 Part D coverage. If you opt in, your plan can spread your covered out-of-pocket prescription costs across monthly bills during the plan year instead of making you pay a large amount all at once at the pharmacy.

This does not reduce the total amount you owe. It changes the timing. That could help if one expensive refill early in the year would squeeze your cash flow, but it might not help if you prefer to pay as you go.

It also does not apply to premiums. If you enroll, keep an eye on both bills: your regular plan premium and your monthly payment-plan bill.

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Negotiated prices expand

A second group of Medicare-negotiated drug prices takes effect in 2027 for 15 Part D drugs selected by CMS. These negotiated prices are scheduled to apply starting January 1, 2027.

This could matter if one of your prescriptions is on the 2027 negotiated-price list. The lower negotiated price can affect what the plan pays, while your cost depends on your deductible status, tier placement, and whether you have already reached the out-of-pocket cap.

Part D plans must cover drugs with Medicare-negotiated prices in effect, but that does not guarantee a low-cost refill. Prior authorization, step therapy, or quantity limits may still apply, so check your plan's requirements before filling a prescription.

Formularies still matter

Part D plans can change their covered drugs, pharmacy networks, cost-sharing tiers, and utilization rules for 2027, subject to Medicare's coverage requirements. Plans generally send an Annual Notice of Change before open enrollment, and that notice is where many of the unpleasant surprises first appear.

Look for your exact drug name, dose, and quantity. A drug moving from a preferred tier to a non-preferred tier could raise your cost even if the drug remains covered.

Your pharmacy also matters. A plan might charge less at preferred pharmacies than at standard pharmacies in its network. If you use one pharmacy out of habit, compare prices there and at nearby preferred options before you renew.

Extra Help updates

Extra Help, the Part D low-income subsidy, could reduce premiums, deductibles, and prescription cost sharing if you qualify. The program uses income and resource limits that can change over time, so check the current limits before assuming you do or do not qualify.

For 2026, the annual income limits are $23,940 for individuals and $32,460 for married couples, while the resource limits are $18,090 and $36,100, respectively. These are 2026 benchmarks, not confirmed 2027 eligibility limits. Income limits are higher in Alaska and Hawaii, and some income and resources do not count when determining eligibility.

These limits matter because your eligibility can change from year to year. A change in income, savings, marital status, or household size could make you newly eligible or change the help you receive.

If you qualify, the savings might be bigger than switching plans on your own. But you should still compare plans, because Extra Help does not make every formulary or pharmacy network work equally well for your prescriptions.

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Bottom line

The big takeaway is simple for knowing if you're on track for retirement: Your 2027 Part D costs can depend on more than the premium. The out-of-pocket cap, deductible, payment-plan option, negotiated prices, formulary rules, pharmacy network, and Extra Help limits can all affect what leaves your wallet.

Before December 7, run your current prescriptions through Medicare's plan comparison tool, check your Annual Notice of Change, and call your plan if any drug has a restriction you do not understand.

If the numbers still feel confusing, ask your local State Health Insurance Assistance Program for free counseling. A one-hour review could help you avoid a year of expensive surprises.

FAQs

When can I change my Medicare Part D plan for 2027?

Medicare open enrollment runs from October 15 through December 7, 2026. You can review your coverage and switch plans during this period, with changes taking effect January 1, 2027.

Does the Medicare Prescription Payment Plan lower my drug costs?

No. It lets you spread your covered out-of-pocket prescription costs across monthly bills during the calendar year. Participation is voluntary and free, but it does not reduce what you owe. You still pay any plan premium separately.

Can I apply for Extra Help outside open enrollment?

Yes. You can apply for Extra Help at any time. The program helps eligible people with limited income and resources pay Part D premiums, deductibles, and prescription costs. If you previously did not qualify, you can reapply if your income or resources change.