Medicare Part D Prescription Drug Coverage

Source: CMS, September 2026.

Each plan sets its own tiers. Review every plan’s formulary.

The pharmacy you use can shift your yearly cost as much as the plan you pick. Most plans split their network into preferred and standard pharmacies. Preferred pharmacies offer lower negotiated prices and frequently lower copays; standard pharmacies remain in network but tend to be pricier. Out-of-network pharmacies are generally not covered outside of limited situations.

For ongoing blood pressure, cholesterol, diabetes or thyroid medications, check a 90-day mail-order fill in the plan finder. For many people, nothing cuts costs more easily.

When large drug bills arrive early in the year, the Medicare Prescription Payment Plan allows you to break your out-of-pocket drug costs into monthly installments over the year rather than paying at the pharmacy counter. Every Part D plan and every Medicare Advantage plan with drug coverage offers it, and the total amount you owe stays the same.

When your income and savings are limited, two programs can greatly lower your Medicare costs:

If you qualify for both Medicare and full Medicaid, you may also be able to join a Dual Special Needs Plan. See help for low-income Part D beneficiaries.

A drug you take may not be on a plan’s 2027 formulary, or it may come with a rule such as prior authorization. Even then, you have options:

See steps to appeal a Medicare Part D denial.

The Annual Notice of Change must reach members by September 30. It is the most useful single document you receive each fall, since it spells out exactly how your plan will change on January 1.

Outside of the fall and early-year windows, changing plans generally requires a Special Enrollment Period. Typical reasons include:

Every Special Enrollment Period has a separate time limit, so move as soon as the event occurs.

Every Part D plan sends CMS a bid. From those bids, CMS sets the national average monthly bid amount, which is $296.05 for 2027, and the base beneficiary premium, which is $41.33 for 2027. The base premium feeds into the late penalty and subsidy calculations; what you actually pay depends on your plan and region. Under federal law, growth in the base premium is capped at 6% a year through 2029.

At minimum, a basic plan provides Medicare’s standard benefit. An enhanced plan layers on extra coverage, like a smaller deductible or reduced copays, typically at a higher premium. CMS reports that for 2027, 88% of non-low-income beneficiaries have access to a basic plan costing $10.30 a month or less, and 93% can find an enhanced plan for under $6.

When you turn 65 in 2027, you get a seven-month Initial Enrollment Period: the three months before your birthday month, the birthday month itself and the three months that follow. If you sign up in the first three months, coverage begins on the first day of your birthday month.

Prior authorization is required by most Medicare Advantage plans for certain services, including some surgeries, advanced imaging, skilled nursing stays and some drugs. While your doctor usually submits the request, ask whether a scheduled service needs approval so you are not caught off guard by a denial.

You or your doctor can appeal a denied request. Medicare rules give plans deadlines for decisions, and those deadlines are shorter when a wait could seriously harm your health.

Emergency and urgent care are covered by every Medicare Advantage plan anywhere in the U.S., whether in or out of network, and an emergency does not require prior approval. Routine care while traveling is different: HMOs generally do not cover it, and PPOs cover out-of-network care at a higher cost.

If you’re away from home for months each year, ask every plan how it covers care where you stay. This is among the most frequent reasons people change plans partway through the year.

You have the right to appeal if your plan denies a service, a drug or payment for care. The denial notice from the plan explains the process. Appeals have several levels, beginning with the plan and moving on to independent reviewers.

If your issue isn’t about coverage, such as wait times or customer service, you can file a grievance with your plan. For help, you can also reach out to 1-800-MEDICARE or your State Health Insurance Assistance Program.

Of the major figures, only the Part B premium is not published alongside the plans. CMS typically announces it in November. Projections in the 2026 Medicare Trustees Report put the 2027 standard premium at about $209.50 a month and the deductible at about $292, up from $202.90 and $283 in 2026. You continue paying it even with Medicare Advantage.

Miss the Annual Enrollment deadline and your current plan automatically renews for 2027, including the changes listed in your Annual Notice of Change. Medicare Advantage members get one more opportunity, from January 1 to March 31, 2027, to change Medicare Advantage plans or go back to Original Medicare and join a Part D plan.

Many Medicare Advantage plans may cover telehealth for some services, at times with a lower copay than an in-person office visit. It is handy for follow-ups and minor problems, but you still need to confirm that your regular doctors are in network.

You do not need to compare plans by yourself, and help should not cost you anything. Here are the free options:

Gather your Medicare card, a list of your drugs and doses, your doctors and your preferred pharmacies before you call. That way a long conversation becomes a quick one.