Best Medicare Part D Providers

SilverScript is the best Medicare Part D provider for customer service availability

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Medicare Part D is the portion of Medicare that covers prescription drug costs. Medicare requires all Medicare-eligible persons to have some form of prescription drug coverage—this means your Part D plan must meet certain standards.

Anyone who is eligible for Medicare is eligible for Medicare Part D. That includes people who are age 65 or older, as well as people who have a disability that qualifies them for Social Security Disability Insurance (SSDI).

Open enrollment for Medicare Part D lasts from April 1 to June 30. During this time, you can change or drop your current Part D plan or enroll in a new one. If you do not enroll by June 30, you will need to wait until the following April to enroll in Medicare Part D.

Whether you are new to Medicare or shopping for a medication plan that better fits your needs, selecting a Medicare Part D plan requires careful research. If you select a plan that does not cover most of your medications, you could pay significant out-of-pocket costs.

We have researched the best Medicare Part D plans in terms of states covered, premium costs, Medicare ratings, website ease of use, and prescription pricing transparency. Keep reading to find out how you can shop for the best Medicare Part D plan as well as information on our research of the top companies and their plans.

The Best Medicare Part D Providers of 2023

Expert Tip:

If you don’t sign up for Medicare Part D during a key enrollment period, you could be subject to a late enrollment penalty. Medicare will usually require you to pay this penalty throughout the entirety of your prescription drug coverage—so it’s best to enroll on time.

Expert Tip:

Medicare rates Part D plans on a scale of 1 to 5 stars, with a 5-star plan being an “excellent” plan. Factors considered include customer service, drug pricing, and member complaints.

Best Customer Service Availability : SilverScript



Key Specs
  • Pharmacies in-network: CVS, Walmart, Publix, Kroger, and more
  • Size of formulary: 3000+ medications covered
  • Medicare star rating: 4 out of 5
Why We Chose It

SilverScript boasts an extensive formulary, a 24/7 customer service hotline, and a large nationwide network of pharmacies, making it a great option for those seeking high quality customer service and convenience.

Pros & Cons
  • Large pharmacy network, including CVS

  • 24-hour customer service line

  • Choice plan available in 50 states and the District of Columbia

  • Only two plans to choose from

  • Plus plan not available in Alaska


SilverScript is a CVS Health company, adding convenience in terms of retail pharmacy access. CVS Health and Aetna merged in 2018, so CVS is now a subsidiary of Aetna, which is listed as the benefits provider when searching for this plan. This merger has enabled CVS Health to grow its Part D plans, and an estimated 23% of all Part D subscribers held a CVS Health policy in 2019 (the earliest available data). 

SilverScript Insurance Company holds the most popular of CVS Health’s available plans: the SilverScript Choice plan. This plan covers thousands of generic and specialty medications and includes a $0 deductible on Tier 1 and Tier 2 medications with low to no copays if you use a SilverScript preferred pharmacy. Prices will vary by state and other factors, such as costs of healthcare in the region, your age, and overall health. For comparison purposes, we reviewed the SilverScript Choice Plan for Houston, where the monthly premium was quoted at $21.20. 

SilverScript’s Plus plan is pricier at $77.30 in Houston. However, the drug deductible is $0 (compared with $360 for the Choice plan). The Plus plan has a more expansive formulary, which may be beneficial to you if you take several medications or specialty medications.

Expert Tip:

It’s important to note that although SilverScript is a CVS Health company, the company’s preferred pharmacies include other well-known retail locations. These include Albertsons, Kroger, Publix, and Walmart.

The Plan received a 4-star (above average) Medicare rating and is known for its customer service, which includes a 24-hour question line and easy access to an online document library that contains an enrollment guide, claims forms, and formulary lists in one location.

Best Decision-Making Tools : AARP/UnitedHealthcare



Key Specs
  • Pharmacies in-network: Walgreens, CVS, Meijer, and more
  • Size of formulary: 2000+ medications covered
  • Medicare star rating: 3.5 out of 5
Why We Chose It

AARP features a unique Get a Plan Recommendation tool to help you choose the right plan for your medication and dosage needs. Although its formulary is slightly smaller than competitors, AARPs partnerships with Walgreens and UnitedHealthcare make for a more streamlined healthcare experience.

Pros & Cons
  • Walgreens partnership offers discounts

  • Plan recommendation tool makes choosing easier

  • Switches between two websites for education

  • Must create a profile to view summary of benefits


AARP’s Part D plans represent a strategic partnership with UnitedHealthcare, much like CVS and SilverScript have. AARP/UnitedHealthcare also has a large market share for Part D plans. An estimated 20.8% of Part D enrollees participated in a UnitedHealthcare drug plan for 2019. UnitedHealthcare’s Part D Plan in Texas earned a 5-star plan rating in 2020, and the company has an overall 3.5-star rating. 

All three of AARP’s drug plans were in the top 10 for enrollment in 2019: AARP MedicareRx Preferred, AARP MedicareRx Saver Plus, and AARP MedicareRx Walgreens. 

We reviewed its plans in Chicago, where all received a 3.5-star rating. True to its name, the Saver Plus was the least expensive premium at $23.60, while the Preferred plan was $81.50 per month. The Preferred plan has a $0 deductible and a more comprehensive formulary when compared with the Saver Plus.

The Walgreens plan was $32.60 in Chicago, and this plan leverages AARP’s partnership with Walgreens to offer the lowest co-payments when filling a prescription there or at Duane Reade.

Both AARP and UnitedHealthcare offer information about their Part D plans on their websites. You sometimes have to switch between the two, which can seem time-consuming. However, we liked UnitedHealthcare’s Get a Plan Recommendation tool, which helped us to answer a few questions and input our medications and dosages to compare available plans and estimated costs.

Expert Tip:

Medicare requires each Part D formulary cover at least two medications in each major drug category in its “preferred” tier. This is a lower-cost tier where medications are more affordable.

Best Low-Premium Pricing : Humana



Key Specs
  • Pharmacies in-network: Walmart, Sam's Club, Costco, and more
  • Size of formulary: 5000+ medications covered
  • Medicare star rating: 4 out of 5
Why We Chose It

Humana features a large formulary with some of the lowest premiums in the United States, as well as cost-sharing at Walmart pharmacies. Its Medication Therapy Management program provides personalized guidance to ensure your medication costs are as low as possible.

Pros & Cons
  • Strategic partnerships lower costs

  • Walmart Value Rx Plan offers the lowest premiums nationally

  • Medication Therapy Management program

  • Offered in all 50 states and the District of Columbia

  • Website light on educational tools

  • No 24-hour helpline


Humana offers three Part D Plans, one of which was introduced in 2020. The new plan is the Humana Walmart Value Rx Plan, which offers an average premium of $17.20 and which the company reports is the lowest of its kind in 47 states and the District of Columbia. The new plan offers preferred cost-sharing at pharmacies at Walmart and its subsidiaries. Humana’s strategic partnerships with Walmart, Walmart Neighborhood Markets, and Sam’s Club mean more opportunities for you to save.

Additional plans include the Humana Basic Rx Plan and the Humana Premier Rx Plan. We looked at the average premium costs in Los Angeles, where the Basic plan was $30.30 and the Premier plan was $72.50. The Premier plan is costlier but features a larger listing of in-network pharmacies and more drugs on its formulary. The Basic plan features a deductible of $435 toward all drug tiers, while the deductible for other plans applied only to tiers 3, 4, and 5.

Its website quote tools were efficient, as you could import your list of medications from This saved time and allowed for a more precise estimation of yearly drug costs. You could also compare the plans side-by-side. We were missing some educational elements or decision tools from Humana’s site that could make selecting a plan easier.

One of the value-added services Humana offers to members taking more than eight medications or with chronic health conditions such as diabetes or chronic heart failure is its Medication Therapy Management program. This service helps you schedule a meeting with a local pharmacist to evaluate the list of medicines you’re taking to help identify potential interactions as well as cost-saving opportunities.

Best Wellness Perks : Cigna



Key Specs
  • Pharmacies in-network: Publix, Rite Aid, Target, Kmart, and more
  • Size of formulary: 3000+ medications
  • Medicare star rating: 3.5 out of 5
Why We Chose It

Cigna has one of the largest pharmacy networks and formularies in the nation. Plan D policies include enrollment in Cigna's Healthy Rewards program, providing participants with access to such wellness perks as discounted fitness programs, vision services, and more.

Pros & Cons
  • 63,000 pharmacies in-network

  • Formulary covers more than 3,000 medications

  • Benefit forms translated to Spanish are readily available

  • Part D coverage in all 50 states and the District of Columbia

  • No current pharmacy partnership

  • No side-by-side plan comparison tool


Cigna-Healthspring (Healthspring is an insurance division of Cigna) has an impressive pharmacy network—there are more than 63,000 locations across the country. Obtaining medications from in-network pharmacies will provide you the greatest cost savings. Additionally, Cigna’s plans have a formulary that has at least 3,000 medications, providing further cost savings. It offers Part D coverage in all 50 states and the District of Columbia. While it has a large pharmacy network, Cigna does not have a key strategic partnership that can offer further cost savings than a preferred network.

Cigna offers three plans: Cigna-HealthSpring Rx Secure, Rx Secure-Essential, and Secure-Extra. The Secure plan is its “basic protection” plan, which can help if you receive Extra Help in paying for medications or don’t currently take a lot of medications. We were quoted a monthly premium of $23 for the Asheville, North Carolina, ZIP code, with coverage that includes free generic medications with no-cost home delivery.

Cigna’s Secure-Extra program is a program for those who benefit from a larger formulary and more cost protection (for example, if you have many chronic medical conditions). We were quoted a monthly premium of $60.00 for Asheville, which is still on the lower side of premier plans. The pharmacy deductible for this plan is $100, whereas the other plans have a $445 deductible.

Cigna’s website offers a quote tool on the landing page. We liked that its forms, including the summary of benefits, star ratings, and enrollment forms, were available in both English and Spanish on our results listing. Cigna’s overall star ratings performed higher than average at 3.5 stars, but we have reviewed plans that consistently achieved 4-star or higher ratings.

Participation in a Cigna Part D plan means you have access to its Healthy Rewards program. This provides discounts to fitness, vision, wellness, and alternative medicine programs.

Best Plan Variety : WellCare



Key Specs
  • Pharmacies in-network: Walgreens, CVS, Amazon, and more
  • Size of formulary: 2000+ medications covered
  • Medicare star rating: 3.5 out of 5
Why We Chose It

Wellcare offers one of the largest networks of pharmacies in the United States and more plans to choose from than most competitors. Its Medication Therapy Management program offers participants a one-on-one review of their plan each year to check for drug interactions and cost-saving opportunities.

Pros & Cons
  • Six plans to choose from

  • 68,000 in-network pharmacies

  • Available in 50 states and the District of Columbia

  • No-frills website

  • No plan comparison tool


WellCare is a nationwide company that has 68,000 network pharmacies—a very comprehensive network. It also offers six plan choices that range in price and coverage from basic to premium. 

We priced WellCare’s Part D plans in Phoenix. The options and monthly premiums were Select ($13.10), Wellness Rx ($14.50), Value Script ($17.40), Classic ($24.90), Rx Saver ($31.70), and Value Plus ($73.30). With the exception of the Value Plus program, most premiums are under or close to the national average.

As a plan overall, Medicare awarded WellCare 3.5 stars. Its Value Script, Select, and Wellness Rx plans don’t have a deductible for Tiers 1 and 2, and neither does the Value Plus plan.

The website doesn’t have a lot of educational tools or intricate designs, but it is clean and easy to follow. Because there are so many plans, a plan comparison tool would have helped in evaluating each option. The site does feature downloadable forms in both English and Spanish, with a multi-language interpreter service in a wide variety of languages.

For those who take multiple medications or have chronic medical conditions, WellCare offers a Medication Therapy Management program. This approach allows you to participate in a one-on-one review annually with a pharmacist or pharmacy staffer to check for drug interactions and provide tips to best manage your health. WellCare also offers an enhanced Healthy Living Program in 11 states: Arizona, Florida, Iowa, Louisiana, Minnesota, Montana, North Dakota, Nebraska, South Dakota, Virginia, and Wyoming. This voluntary program provides a health coach, a dedicated call center, and an educational website.

Best Price Transparency : Mutual of Omaha



Key Specs
  • Pharmacies in-network: CVS, Walmart, Safeway, and more
  • Size of formulary: 2000+ medications covered
  • Medicare star rating: Not yet rated
Why We Chose It

Mutual of Omaha's Part D plan is new and has a smaller formulary and pharmacy network compared to competitors. However, it has highly competitive pricing with $0 deductible for Tier 1 and 2 plans, as well as numerous, easy-to-use educational tools to simplify plan selection.

Pros & Cons
  • Offered in 49 states (not available in New York)

  • Pricing by state available on summary of benefits

  • Many current educational resources

  • Plans are too new to receive a CMS star rating

  • Only two plans offered


While Mutual of Omaha may be new to Medicare Plan Part D participation, its company reputation (it's been in business for more than 110 years), plan offerings, and clean, easy-to-understand website make it one of the top insurance companies. Mutual of Omaha launched its Part D plans to 49 states and the District of Columbia in 2019.

The company offers two plans: Mutual of Omaha Rx Value and Mutual of Omaha Rx Plus. We priced its plans in Baltimore and were quoted a monthly price of $30.10 for the Value plan and $63.00 for the Plus plan. According to the benefits overview, the Plus Plan ranges from $46 to $63.90 while the Value plan ranges from $21.70 to $30.90. Mutual of Omaha offers preferred pricing at more than 24,000 pharmacies, including big names like CVS, Walmart, Sam’s Club, and CVS/Target.

Mutual of Omaha offers $0 copays on Tier 1 medications at preferred pharmacies and via its mail-order options. It also offers a $0 deductible on Tier 1 and Tier 2 medications as part of its value plan, which made it one of the most competitive plans we reviewed for tier pricing.

Mutual of Omaha’s website was also a standout for using easy-to-understand callouts and illustrations. It also has a separate library of articles that educates consumers without specifically discussing the products. We liked the “Know More About My Medicare Options” section, which included a guide to understanding Part D drug plans.

Final Verdict

Choosing the right Medicare D provider can help you avoid hefty medication costs in the future. For exceptional customer service and a large pharmacy network, consider SilverScript. There are two highly rated plans to choose from and they are fairly affordable, though prices will vary depending on the state you live in.

Compare the Best Medicare Part D Plans

  Pharmacies in-network Size of formulary  Medicare star rating
Best Customer Service Availability
CVS, Walmart, Publix, Kroger, and more  3000+  4
Best Decision-Making Tools
Walgreens, CVS, Meijer, and more  2000+  3.5
Best Low-Premium Pricing
Walmart, Sam's Club, Costco, and more  5000+  4
Best Wellness Perks
Publix, Rite Aid, Target, Kmart, and more  3000+  3.5
Best Plan Variety
Walgreens, CVS, Amazon, and more  2000+  3.5
Best Price Transparency
Mutual of Omaha
CVS, Walmart, Safeway, and more  2000+  Not yet rated

How to Shop for Medicare Part D Plans 

Step 1: Enroll in Medicare 

You are first eligible to enroll in a Part D plan under three circumstances.

  • Initial enrollment period: This is the time period when you’re first eligible for Medicare. It’s a seven-month stretch that starts three months before your 65th birthday and goes up to three months after your birthday.
  • Disability coverage under age 65: If you qualify for disability coverage under age 65, you are eligible to sign up for Part D as soon as 21 months after you first receive your disability benefits and up to 28 months after you have received your Social Security benefits.
  • Loss or change of drug coverage: Sometimes, you may belong to a Part D or Medicare Advantage plan that stops offering prescription drug benefits—or you lose your benefits from an employer’s insurance plan. At this time, you have a special enrollment period of up to 63 days during which you can enroll in new prescription drug coverage.

Step 2: Find Out Which Companies Offer Medicare Plan D in Your Area

Medicare Plan D options are region-specific. This means not all companies offer the same plans (or premiums) in every area. You can find out about available plans by using the Plan Finder tool on You can also visit a company’s website and search for its Part D plans.

Step 3: Make a List of All Your Prescriptions

When evaluating each plan, it’s important to read through each plan’s formulary, which is the list of the medications the particular plan covers. If you have a list of your medications, you can compare it to a plan’s formulary. Ideally, you can choose the plan that covers all or most of your prescriptions.

Step 4: Compare Prices and Premiums Among Plans

The cost of your medications isn’t the only consideration. You’ll also want to evaluate the monthly premium for your plan. The premium should be affordable to you relative to what you may pay for your medicines.

Step 5: Talk to an Insurance Broker or Consultant

Unless evaluating Medicare plans is something you do every day, it’s understandable that you’ll have questions. An excellent resource is your State Health Insurance Assistance Program (SHIP), a nationwide network of programs that provide free, unbiased counseling for Medicare benefits. You can also speak to an insurance broker or consultant, keeping in mind they may not be unbiased, but they may have access to better pricing for some plans.

Step 6: Sign Up

Once you select a plan, you can usually sign up online. If you go through an insurance broker, they may also assist you in the sign-up process, either online or via a paper form. Once your application is accepted, the insurance company will notify you when your Part D plan starts and will send you your insurance card.

Frequently Asked Questions

How Do I Enroll in Medicare Part D?

You can enroll in Medicare Part D as soon as you have your Medicare Number. Search for prescription drug plans via Medicare’s Plan Finder, or by individual insurance companies. After selecting your plan of choice, the application will ask for your Medicare Number as well as when you were first eligible for coverage.

How Much Should I Expect to Pay for Medicare Part D?

When it comes to Medicare, there are standalone Part D plans and plans that are a part of a Medicare Advantage (Medicare Part C) plan. In 2019, the average monthly premium for all Part D plans was $29.20, while the average cost for standalone Part D plans was $39.63.

Does Medicare Cover Insulin?

How Medicare covers insulin depends on the type you use. For example, if you use injectable insulin, Medicare Part D covers the insulin as well as supplies you may need to inject the insulin, such as alcohol swabs and syringes. However, if you use an insulin pump, Medicare Part D may only cover certain types of insulin and insulin pumps.

What Is the Difference Between Medicare Part B and Part D?

Medicare Part B is the portion of Medicare that covers medical expenses, such as doctor's visits, medical equipment, and drugs that are administered by a healthcare provider, like vaccines. Medicare Part D, on the other hand, covers the cost of prescription drugs, like insulin, that are self-administered.

Who Has the Cheapest Part D Drug plan?

Humana Walmart Value Rx Plan is the cheapest Part D Rx plan in the United States with an average premium of $17.20. Unlike Original Medicare, the Humana Walmart Value Rx Plan covers most copays and deductibles. Furthermore, over 3500 medications are covered by the Humana Walmart Value Rx Plan.


Our selection of the Best Medicare Part D companies involved looking at companies whose ratings were consistently at 3 stars or higher for the national average, which worked out to be about 20 companies. We then further narrowed the list by coverage area, giving preference to companies that offered plans to 40 states or more so our recommendations can benefit the greatest number of readers. Additional considerations included website ease of use, plan variety, premium costs, perks or extra benefits, and the presence of strategic, cost-saving partnerships.

Please contact or 1-800-MEDICARE (TTY users should call 1-877-486-2048) 24 hours a day/7 days a week to get information on all of your options.

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Article Sources
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
  1. SilverScript. 2022 formulary.

  2. Kaiser Family Foundation. 10 things to know about Medicare Part D coverage and costs in 2019.

  3. AARP. Complete drug list (formulary) 2023.

  4. Centers for Medicare and Medicaid Services. Fact Sheet - 2020 Part C and D Star Ratings.

  5. Humana. 2023 prescription drug guide.

  6. Cigna. 2023 Cigna comprehensive drug list (formulary).

  7. Wellcare. Comprehensive formulary 2023.

  8. Mutual of Omaha Rx. Mutual of Omaha Rx (PDP) 2023 formulary.