
Medicare Part D is a prescription drug coverage plan that helps cover prescription drug costs. It is sold through private insurance companies and is available to Medicare enrollees. Part D plans differ in the types of drugs they cover and vary in costs. The costs of Part D plans consist of several different payments, including a monthly premium, which is paid in addition to the one you pay for Medicare Part B. Medicare Part D prescription drug plans can help cover the costs of your medications.
| Characteristics | Values |
|---|---|
| Description | Medicare Part D is a part of Medicare that helps cover prescription drug costs |
| Type of plan | Standalone or bundled with Medicare Advantage plans |
| Drugs covered | Each plan has its own drug list (formulary) |
| Cost coverage | Each plan has its own level of cost coverage |
| Monthly premium | Most people will pay the standard monthly premium. However, you may have to pay an extra amount because of your annual income |
| Annual deductible | For plans that have an annual deductible, the 2025 limit set by Medicare is $590 |
| Late Enrollment Penalty (LEP) | Fail to enroll in a Part D plan when eligible and you may end up paying a late enrollment penalty. For every month delayed, Medicare will charge a small fee, added to the monthly premium |
| Extra Help | Medicare provides assistance, known as Extra Help, in paying for prescription drug costs for those with limited income and resources |
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What You'll Learn

Part D prescription drug coverage
Medicare Part D is a prescription drug coverage plan that helps cover prescription drug costs. It is available to Medicare enrollees and is sold through private insurance companies as a standalone plan or as part of a Medicare Advantage plan. Standalone Part D plans may also be added to Original Medicare, a Medicare Supplement (Medigap) insurance plan, or a Medicare Advantage plan without drug coverage.
Part D plans differ in the types of drugs they cover and the costs involved. Each plan has its own drug list, known as a formulary, which determines what is and isn't covered. The formulary may differ from plan to plan and may be arranged into different levels or tiers, with drugs in lower tiers generally costing less than drugs in higher tiers. Some medications may not be covered by your Medicare Part D plan, and some plans may have restrictions on certain medications. These restrictions can include prior authorization, step therapy, and quantity limits.
The costs for Medicare Part D consist of several different payments, including a premium, which is a monthly fee paid in addition to the one for Medicare Part B. The premium can be automatically deducted from your savings or checking account, charged to a credit or debit card, deducted from your Social Security benefit, or billed to you by your insurer. You may also have to pay an extra amount because of your annual income. Additionally, there may be an annual deductible, copays, and coinsurance. The amount you pay out of pocket will vary depending on the plan, the tier of the drug, and the pharmacy you use.
It is important to review the details of the drug coverage offered by each Part D plan to ensure that it meets your prescription needs. You can use tools like BenefitsCheckUp to browse benefits programs and estimate your drug costs based on your medication list. If you need help choosing a plan or covering prescription drug costs, you can contact your local State Health Insurance Assistance Program (SHIP) for free assistance.
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Part D plan options and costs
Medicare Part D prescription drug plans help cover the costs of medications. Part D plan options include stand-alone prescription drug plans (PDP) and Medicare Advantage plans that cover prescription drugs (MA-PD). In 2025, the average Medicare beneficiary has 48 options for Part D coverage, including 14 PDPs and 34 MA-PDs.
Each Medicare Part D plan has a list of approved drugs called a drug formulary, which may differ from plan to plan. Many plans arrange their formulary into different levels, or tiers, with drugs in lower tiers costing less than drugs in higher tiers. Some medications may not be covered by your plan, depending on its formulary, which may limit coverage of some drugs based on medical necessity, cost, or safety. Some prescription drug plans may have additional restrictions on certain medications, such as prior authorization, step therapy, or quantity limits.
The costs of Part D plans vary depending on the plan, the tier of a drug, and the pharmacy used. Most prescription drug plans require a premium, or a monthly fee, in addition to the monthly fee for Medicare Part B. If your income is above a certain limit, you may also have to pay a monthly adjustment payment. Some plans may also have a deductible, which is an amount you pay for covered drugs and items each year before your plan starts to pay. The deductible will depend on your plan, with no Medicare drug plan deductible exceeding $590 in 2025. For some drugs, you may also have to pay a copayment, or a fixed amount, and coinsurance, or a percentage of the cost, at the pharmacy. If you have to pay a Part D late enrollment penalty, it will be added to your monthly premium.
There are several programs that can help with the costs of Part D medications. Pharmaceutical Assistance Programs (PAPs) are offered by some pharmaceutical companies to help pay for medications for people enrolled in Medicare drug coverage. Each company has different eligibility requirements for their program. Medicare's Extra Help program helps pay for drug costs if you qualify for Medicaid, a Medicare Savings Program, or Supplemental Security Income (SSI) benefits. Medicare's Limited Income Newly Eligible Transition (LI NET) program provides temporary prescription drug coverage at the pharmacy counter for people who qualify for Extra Help but are not yet enrolled in a Medicare drug plan.
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Part D Extra Help for low-income individuals
Medicare Part D prescription drug plans help cover the costs of medications. Each plan has a list of approved drugs, known as a drug formulary, which decides what is and isn't covered. The formulary may differ from plan to plan. Some medications may not be covered by your Medicare Part D plan, and this could depend on your plan's formulary, which may limit coverage based on medical necessity, cost, or safety.
The Extra Help program is a federal program that assists individuals with limited income and resources in lowering or eliminating their Part D costs. It helps cover the costs of prescription drugs, such as deductibles and copays. This program is also referred to as the Part D Low-Income Subsidy (LIS). To be eligible for Extra Help, your monthly income must be within a certain limit, which is $1,976 for individuals and $2,664 for couples in 2025. Additionally, your assets, such as savings accounts, stocks, and real estate, must be below specified limits.
You can apply for Extra Help at any time before or after enrolling in Part D. Your eligibility will be determined based on your financial information. If you qualify for Extra Help, you will be automatically enrolled in a Medicare drug plan (Part D) if you don't already have one, ensuring that you receive the cost savings you are entitled to. Even if your income changes during the year, you will continue to receive Extra Help through the end of the calendar year.
It is important to note that Extra Help is not a substitute for Part D or a standalone plan. To receive Medicare prescription drug coverage through Extra Help, you must still have a Part D plan. Additionally, Extra Help is not available in certain U.S. territories, including Puerto Rico, the U.S. Virgin Islands, Guam, the Northern Mariana Islands, and American Samoa. However, other programs are available in these areas to assist individuals with limited income and resources.
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Part D plan drug formulary
Medicare Part D prescription drug plans help cover the costs of medications for everyone who qualifies for Medicare. Each Part D plan has a list of drugs that are covered by the plan, known as a Drug Formulary or "Drug Guide". This formulary is essentially an inventory of all the generic and brand-name prescription drugs covered by a Medicare drug plan.
The formulary may differ from plan to plan, and many plans arrange their list of covered drugs in different levels, or "tiers". Generally, drugs in a lower tier will cost less than drugs in a higher tier. For example, Tier 1 may include generic or brand drugs that are available at the lowest cost, while Tier 4 may include non-preferred brand drugs that are offered at a higher cost.
It is important to note that some medications may not be covered by your Medicare Part D plan. This could depend on your plan's formulary, which may limit coverage based on medical necessity, cost, or safety. Your plan may also have certain restrictions on specific medications, such as requiring prior authorization or step therapy. If your medication is not covered, you can submit a formal request for an exception to a drug coverage rule, or appeal the decision.
To predict the cost of a specific drug, it is helpful to know what tier it is in and to review your plan's benefits. Additionally, it is worth noting that all Part D plans generally must cover at least two drugs per drug category, but each plan can choose which drugs covered by Part D they will offer.
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Part D prescription drug plan premiums
Medicare Part D prescription drug plans help cover the costs of medications. The costs of prescription drugs under Part D vary depending on the plan, the drug tier, and the pharmacy used. Most prescription drug plans require the payment of a premium, or a monthly fee, in addition to the one paid for Medicare Part B. This premium is subject to variation depending on the plan, the tier of the drug, and the pharmacy used.
The amount of coverage provided by Part D plans is determined by their drug formulary, which lists the drugs that are covered and their associated costs. The formulary may differ between plans and typically organises drugs into tiers based on cost, with lower-tier drugs being more affordable than higher-tier ones. Some medications may not be covered by a plan's formulary, and certain plans may impose restrictions on specific medications, such as prior authorisation or step therapy requirements.
If an individual's desired medication is not covered by their plan, they can submit a formal request for an exception to the drug coverage rule. This process may involve appealing to include a non-formulary drug in their coverage or waiving a step therapy requirement to access a lower-tier drug. Additionally, there are programs available to assist with the costs of prescription drugs under Part D, such as the Extra Help program, which supports individuals with deductibles and copays, and the Limited Income Newly Eligible Transition (LI NET) program, which offers immediate prescription drug coverage at pharmacies for those who qualify.
The Part D late enrollment penalty is an important consideration, as it results in an additional charge to the premium for those who enrol after their Initial Enrollment Period. This penalty is calculated by multiplying 1% of the "national base beneficiary premium" by the number of full months an individual was eligible but did not enrol in Medicare drug coverage. The late enrollment penalty is added to the premium for the duration of Medicare drug coverage, and the amount may increase annually if the "national base beneficiary premium" rises.
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Frequently asked questions
Part D is a type of insurance that helps cover prescription drug costs. It is sold through private insurance companies as a standalone plan or as part of a Medicare Advantage plan.
Part D plans differ in the types of drugs they cover. Each plan has its own drug list, known as a formulary, which may limit coverage of some drugs based on medical necessity, cost, or safety.
The cost of Part D Insurance varies depending on the plan, the drugs included, and the pharmacy used. Most plans require a monthly premium, which may be in addition to other monthly fees.








































