Medicare beneficiaries fill an average of 50 prescriptions per year, according to CMS data, making the choice of mail order pharmacy a significant financial and logistical decision. Finding the best mail order pharmacy for Medicare means weighing cost savings, delivery reliability, customer service quality, and how well the pharmacy integrates with your Part D plan. No single answer fits everyone, but this comparison will help you evaluate the top options.
Why Mail Order Matters for Medicare Members
Mail order pharmacies offer Medicare beneficiaries several advantages over retail pickups. A 90-day supply shipped to your door typically costs less than three separate 30-day retail fills. Many Part D plans set lower copays for preferred mail order pharmacies, creating a built-in financial incentive.
Convenience matters too, especially for beneficiaries with mobility limitations or those living in rural areas far from a pharmacy. Auto-refill features ensure continuity of medication supply without the need to call in orders or drive to a store. According to PubMed research, mail order pharmacy use among Medicare beneficiaries is associated with improved medication adherence, particularly for chronic conditions like hypertension and diabetes.
CVS Caremark Mail Order
CVS Caremark is the PBM behind many Medicare Part D plans, including SilverScript, one of the largest standalone Part D plans in the country. Members whose plans use CVS Caremark benefit from a massive pharmacy network that includes both mail order and over 9,500 retail CVS locations.
The mail order service offers free standard shipping, automatic refills, and pharmacist consultations by phone. CVS Caremark’s digital tools, including the website and mobile app, allow members to track shipments, check formulary coverage, and manage their prescriptions without calling. For more details on their mail service, see our CVS Caremark mail service guide and our overview of what CVS Caremark is.
Strengths and Weaknesses
CVS Caremark’s strength lies in its retail backup. If your mail order shipment is delayed, you can visit a nearby CVS for an emergency fill. The weakness is that CVS Caremark’s formularies sometimes favor CVS-owned pharmacies with lower copays, which limits your flexibility if you prefer an independent or competitor pharmacy.
Express Scripts Mail Order
Express Scripts, owned by Cigna, serves millions of Medicare members through various Part D plans. Their mail order pharmacy operates from multiple distribution centers, providing broad geographic coverage and generally reliable delivery times.
Express Scripts offers a robust home delivery program with features similar to CVS Caremark: free standard shipping, auto-refill, and digital management tools. The company also provides a medication cost comparison tool that shows members how switching to a generic or preferred alternative could reduce their costs.
One notable feature is Express Scripts’ Pharmacy Advisory Board, which conducts clinical reviews to ensure formulary decisions consider patient outcomes alongside cost. For contact information, see our Express Scripts address and phone number guide.
OptumRx Mail Order
OptumRx, owned by UnitedHealth Group, manages pharmacy benefits for UnitedHealthcare’s Medicare Advantage and Part D plans, among others. The company’s mail order pharmacy emphasizes clinical integration, connecting pharmacy data with medical claims data to identify potential drug interactions and adherence gaps.
OptumRx’s home delivery service includes free shipping, personalized medication packaging options, and access to a 24/7 pharmacist hotline. Their patient engagement programs, which include proactive outreach for refill reminders and medication reviews, rank well in member satisfaction surveys conducted by the National Committee for Quality Assurance.
How to Compare Mail Order Pharmacies for Your Plan
The best mail order pharmacy for Medicare is ultimately determined by your specific Part D plan. Here is how to evaluate your options systematically.
Check your plan’s preferred pharmacy list. Medicare Part D plans designate certain pharmacies as preferred, offering lower copays. Your plan’s mail order pharmacy is almost always preferred, and using it instead of a non-preferred option can save you hundreds of dollars annually. Log in to your plan’s website or call customer service to verify which mail order pharmacy offers the best pricing.
Compare 90-day costs. Run your most expensive medications through the plan’s cost estimator to see the difference between mail order and retail. Some plans offer identical pricing, while others provide meaningful mail order discounts. Focus on your highest-cost medications first, as the savings potential is greatest there.
Evaluate customer service. Read Medicare Star Ratings, which CMS publishes annually. These ratings include scores for customer service, complaint resolution, and member experience. Plans with higher star ratings generally deliver better service across all channels, including mail order.
Cost Considerations in the Coverage Gap
Medicare Part D’s coverage gap, commonly called the donut hole, affects how much you pay for prescriptions after your initial coverage period ends. Starting in 2025, the Inflation Reduction Act caps annual out-of-pocket spending at $2,000 for Part D beneficiaries, according to CMS. This cap changes the calculus for mail order pharmacy selection.
Under the new cap, your total annual spending is limited regardless of which pharmacy you use. However, reaching the cap more slowly by using a preferred mail order pharmacy means you pay less per prescription in the months before you hit the cap. Choosing the preferred mail order option stretches your dollars further throughout the year.
Specialty Medications and Medicare Mail Order
If you take specialty medications, your mail order options may be more limited. Most PBMs route specialty drugs through their own specialty pharmacy divisions, such as CVS Specialty or Express Scripts’ Accredo. These pharmacies provide additional clinical support, including injection training and side-effect monitoring, that standard mail order pharmacies do not offer.
Specialty drug costs under Medicare Part D can be substantial, often involving coinsurance rather than flat copays. The $2,000 annual cap provides significant relief for specialty drug users, who previously could face thousands of dollars in out-of-pocket costs. When evaluating mail order pharmacies, factor in whether the PBM’s specialty pharmacy division handles your specific medications and what support services they provide.
Switching Mail Order Pharmacies
Switching from one mail order pharmacy to another typically happens when you change Part D plans during open enrollment. If you switch plans, your new plan’s PBM will have its own mail order pharmacy, and you will need to transfer prescriptions. Allow at least two weeks of medication overlap to prevent gaps during the transition.
Within the same plan year, switching mail order pharmacies is generally not practical because your plan designates a specific mail order partner. You can, however, choose to fill at retail instead of mail order, though this may cost more if your plan incentivizes mail order use.
Frequently Asked Questions
Which mail order pharmacy is cheapest for Medicare?
The cheapest option is almost always your plan’s preferred mail order pharmacy. Costs vary significantly between plans, so use your plan’s cost estimator tool during open enrollment to compare before committing to a plan for the year.
Can I use any mail order pharmacy with Medicare Part D?
You can use any pharmacy in your plan’s network, but costs may be higher at non-preferred pharmacies. Most plans have a single preferred mail order pharmacy operated by their PBM.
How long does mail order delivery take for Medicare prescriptions?
First-time orders typically take 7 to 10 business days. Refills generally arrive in 3 to 5 business days. All major mail order pharmacies offer free standard shipping for Medicare members, with expedited options available at additional cost.
Is mail order required for Medicare Part D?
No. Mail order is optional. However, some plans charge higher copays for maintenance medications filled at retail after an initial grace period, effectively encouraging mail order use. Check your plan’s benefit structure to understand any financial incentives.
What if my mail order medication is damaged or lost?
Contact your mail order pharmacy immediately. All major PBM mail order pharmacies will replace lost or damaged shipments at no cost and can arrange an emergency retail fill while the replacement ships.
Making Your Decision
Choosing the best mail order pharmacy for Medicare comes down to your plan’s preferred options, your medication list, and your service preferences. During open enrollment each fall, run your medications through Medicare’s Plan Finder tool at medicare.gov to compare total annual costs across plans, including mail order pricing. The cheapest plan overall is usually the one whose preferred mail order pharmacy offers the best rates on your specific drugs. Once enrolled, set up auto-refill and digital notifications to keep your medications flowing without interruption. For more on how pharmacy benefits fit into healthcare policy, visit our healthcare policy guide.