What is the best Medicare Part D supplement?
There is no single "best" Medicare prescription drug plan (often confused with Part D or Medipgap Plan D), because coverage and costs depend entirely on the specific medications you take and your local ZIP code.
Note that Medicare Supplement (Medigap) Plan D covers standard medical gaps like coinsurance, but it does not cover prescription drugs. Prescription drug coverage is handled separately through Medicare Part D (standalone prescription drug plans).
Top-Rated Medicare Part D Providers
National insurance carriers stand out for different budget and coverage needs:
- Best Overall Availability & Low Deductibles: UnitedHealthcare (AARP) offers extensive nationwide availability and low average deductibles.
- Best for Low Monthly Premiums: Wellcare offers highly competitive, low-cost or $0-premium plans suited for budget-conscious members.
- Best for Low Out-of-Pocket Costs: Humana features widespread $0-copay and low-deductible tiers across many states.
How to Find Your Best Plan
- Make a list of your current prescription medications and dosages.
- Visit the official Medicare Plan Finder tool.
- Enter your ZIP code and your specific drug list to see exact estimated yearly costs (premiums plus copays) for plans available in your area.
Which Medicare Part D plans are the highest-rated?
UnitedHealthcare, Humana, and Wellcare are among the highest-rated and top-performing Medicare Part D prescription drug plan providers.
Top-Rated Providers
- UnitedHealthcare: Ranked as best overall by Investopedia due to nationwide availability and low average deductibles.
- Humana: Recognized by NerdWallet as a top choice for low premiums and low out-of-pocket drug costs.
- Wellcare: Highly rated for budget-friendly monthly premiums and beating major competitors on value.
- Aetna (SilverScript): Noted for high CMS quality star ratings and price accuracy.
- HealthSpring (formerly Cigna): Noted for strong customer satisfaction scores.
Key Factors to Consider
- Formulary: Check if the plan covers your specific prescription drugs.
- Total Cost: Add the monthly premium and yearly out-of-pocket drug costs.
- Out-of-Pocket Cap: The standard maximum out-of-pocket spending cap for Part D is $2,100.
- Star Ratings: The Centers for Medicare & Medicaid Services (CMS) assigns quality scores from 1 to 5 stars.
Who is the best Medicare Part D provider?
The best Medicare Part D provider for standalone prescription drug coverage overall is UnitedHealthcare, which leads in nationwide availability, customer service, and competitive pricing.
Choosing the "best" provider depends on your specific budget, location, and list of medications. Top-rated national providers stand out in different categories:
- Best Overall & Availability: UnitedHealthcare offers widespread coverage, large pharmacy networks, and lower average deductibles on popular plans like AARP Medicare Rx Preferred.
- Best for Low Costs & Premiums: Humana features low average monthly premiums and $0-copay options across many states. Wellcare also offers some of the lowest average premiums and budget-friendly generic drug plans.
- Best for Quality & Satisfaction: Aetna (selling plans under SilverScript) scores high marks for government quality ratings and price accuracy. HealthSpring (formerly Cigna) ranks high for customer satisfaction.
What is the highest premium for Medicare Part D?
The highest monthly surcharge for Medicare Part D in 2026 is $91.00, which is added to your private plan's standard monthly premium.
Understanding Part D High-Income Surcharges
- IRMAA (Income-Related Monthly Adjustment Amount): High earners pay an extra charge on top of their normal prescription drug plan costs.
- Income Thresholds: The highest tier applies to individual taxpayers with a Modified Adjusted Gross Income (MAGI) of $500,000 or more, and married couples filing jointly with an income of $750,000 or more (based on tax returns from two years prior).
- Total Cost: Your exact maximum monthly cost equals your specific private insurance plan's premium plus the top IRMAA surcharge of $91.00.
What is the most highly rated Medicare Supplement plan?
Medigap Plan G is widely considered the most popular and comprehensive highly rated Medicare supplement plan available to new enrollees.
Because Medicare supplement (Medigap) benefits are strictly standardized by the government, a Plan G from one private insurance company provides the exact same core medical coverage as a Plan G from any other company. Ratings and "best plan" distinctions instead apply to the specific insurance carriers offering them based on cost, customer satisfaction, and stability of rate increases.
Top-Rated Insurance Carriers for Medigap Plans
- State Farm: Frequently ranks highest for overall customer satisfaction and slow, stable rate increases over time.
- AARP / UnitedHealthcare: The largest Medigap provider nationwide, recognized for massive enrollment numbers, wide availability, and extra member perks.
- Mutual of Omaha: Consistently praised for strong financial stability, high customer satisfaction, and fast claim processing.
- HealthSpring (formerly Cigna): Noted for having some of the most competitive, low initial monthly premiums on the market.
What Medigap Plan G Covers
- 100% of Part A coinsurance, hospital costs, and hospice care.
- 100% of Part B copayments or coinsurance.
- The Part A deductible.
- The only major item it does not cover is the annual Medicare Part B deductible ($283 in 2026), which you must pay out-of-pocket before coverage kicks in. (Note: Plan F covers this deductible too, but is legally closed to anyone who became eligible for Medicare on or after January 1, 2020).
What you need to know about 2026 Medicare Part D prescription drug deductibles
Which Medicare Part D plans are considered the worst for seniors?
The worst Medicare Part D plans are typically those that earn low star ratings (1 or 2 out of 5 stars) from Medicare, feature high monthly premiums paired with poor drug coverage, or have high consumer complaints.
Because Medicare drug plans change every year and vary heavily by your ZIP code, a plan that is poorly rated in one state might not be offered in another.
How to Identify a Poor Plan
- Low Star Ratings: Medicare rates plans from 1 to 5 stars. Plans with 1 or 2 stars have poor quality and customer service scores.
- High Out-of-Pocket Costs: Plans with high deductibles or expensive copays for your specific medications.
- Restricted Formularies: Plans that do not cover the specific drugs you take or require difficult approval rules like prior authorization (needing permission before the plan pays) or step therapy (trying a cheaper drug first).
- Limited Pharmacy Networks: Plans where your local pharmacy is not "preferred," leading to higher costs.
How to Check Your Specific Plans
- Go to the official Medicare Plan Finder to look up plans available in your area.
- Enter your ZIP code and list your specific medications to see the actual yearly cost for each plan.
- Filter results to avoid plans with low star ratings (fewer than 3 stars).
What Medicare Supplement plan does AARP recommend?
AARP does not recommend a single "best" Medicare supplement plan, but instead endorses a portfolio of AARP Medicare Supplement Plans insured by UnitedHealthcare, leaving the specific choice to individual health needs and budgets.
📊 Popular Options Offered
- G ✅
- Most comprehensive option for new enrollees.
- Covers nearly all out-of-pocket costs.
- Includes Part B excess charges.
- N 💡
- Lower monthly premiums than Plan G.
- Small copays for office and ER visits.
- Requires paying your own Part B coinsurance/deductible specifics.
- A & B 🗒
- Basic foundational benefits.
- Lower initial coverage.
- Higher out-of-pocket exposure.
- K & L 📉
- Shared cost structures.
- Covers 50% (Plan K) or 75% (Plan L) of services.
- Includes annual out-of-pocket spending limits.
- C & F ⚠️
- Comprehensive coverage.
- Restricted to those eligible before 2020.
What is the least expensive Part D prescription plan?
The least expensive standalone Medicare Part D prescription plan nationally is frequently the Wellcare Value Script, which offers $0 monthly premiums in many areas, though exact costs depend heavily on your specific location and medications.
Low-Cost Part D Providers
- Wellcare: Offers some of the lowest average monthly premiums nationwide, including $0 options like the Value Script plan, ideal for generic drugs or avoiding late penalties.
- Humana: Frequently provides some of the lowest basic monthly premiums (averaging around $32) and lower deductibles among major carriers.
- Aetna: Features low-premium tiers starting under $7 in many states with competitive generic copays.
Factors Affecting Your Cost
- Location: Part D plans and pricing change by zip code and state.
- Medications: A $0 premium plan might have a higher deductible or higher copays for your specific brand-name drugs.
- Formulary & Pharmacy: Always check if your specific medications are covered on the plan's formulary and if you use an in-network preferred pharmacy (like Walgreens or CVS).
- Official Tool: You can find the true lowest-cost plan for your specific prescriptions by entering your zip code and medication list on the official Medicare Plan Finder.
Is GoodRx better than Medicare Part D?
GoodRx is not "better" than Medicare Part D overall because GoodRx is a discount coupon program, not insurance.
Key Differences
- Medicare Part D is health insurance. It protects you against catastrophic costs, covers expensive brand-name and specialty medications, and includes an annual out-of-pocket spending cap ($2,100).
- GoodRx is a free price-comparison and coupon tool. It does not replace insurance and does not count toward your Medicare deductible or out-of-pocket maximum.
When GoodRx is Better
- Cheap Generic Drugs: GoodRx often beats insurance copays for low-cost generic medications.
- Uncovered Drugs: If a prescribed medication is not on your Part D plan's formulary (list of covered drugs), GoodRx can lower the cash price.
- Before Meeting Deductibles: If your Part D plan has a deductible and the cash price with GoodRx is lower than what you would pay out of pocket initially.
When Medicare Part D is Better
- Brand-Name and Specialty Drugs: GoodRx offers very little savings on expensive brand-name drugs, which can cost thousands of dollars a month and easily bankrupt a cash-pay patient.
- Safety Net: Part D caps your annual out-of-pocket spending, whereas GoodRx offers no yearly cap or protection if you develop a severe, expensive health condition. Dropping Part D entirely also risks permanent late-enrollment penalties.
You cannot combine GoodRx and Medicare Part D at the register; you must choose to run a prescription through either your insurance or as a cash transaction using GoodRx. Many beneficiaries keep a Part D plan for major protection while spot-checking GoodRx for cheaper generic fills.
Which Medicare Part D plan is better, Wellcare or Humana?
Wellcare and Humana are top-rated NerdWallet's highest-rated Medicare Part D companies in 2026, but they suit different needs based on your budget and prescriptions.
Wellcare Part D Highlights
- Best for low premiums: Known for budget-friendly monthly rates, including some $0 premium options.
- Plan options: Popular choices include Wellcare Value Script and Wellcare Classic.
- Pharmacy network: Frequently partners with major retail chains like CVS, Walgreens, and regional grocers, depending on your area.
- Deductibles: Standard maximum deductibles (up to $615) apply to many plans, though tier-specific exceptions exist.
Humana Part D Highlights
- Best for low out-of-pocket costs: Offers the Value Rx plan, which features $0 cost-sharing on many common drug tiers.
- Plan options: Includes Humana Value Rx, Humana Basic Rx, and Humana Premier Rx.
- Pharmacy network: Frequently features Walmart as a primary preferred pharmacy partner.
- Availability: Offers $0-premium plans across a wide geographic footprint.
Key Differences to Compare
- Your specific medications: Total annual cost depends heavily on the plan's formulary (list of covered drugs) for your exact prescriptions.
- Preferred pharmacies: Check which local pharmacies near you offer the lowest copays for each company.
- Total estimated cost: Combine the monthly premium with your expected annual drug copays.