The best Medicare Part D drug plans of 2026 reviewed by cost and coverage: AARP MedicareRx Preferred earns the highest 4.5-star CMS rating with the broadest formulary, SilverScript Plus offers the best value for generic users, and Humana Premier Rx leads on premium cost at $9.70/month. In 2026, the new $2,000 out-of-pocket cap makes plan selection more important than ever.
By the SeniorSimple Editorial Team | Last updated: May 2026 | Reviewed annually
If you're choosing a Medicare Part D drug plan in 2026, the best plan depends on your specific medications. However, Humana Premier Rx Plan offers the lowest average monthly premium ($9.70/month), SilverScript Plus from CVS/Aetna provides the most comprehensive coverage at mid-range cost, and AARP MedicareRx Preferred (underwritten by UnitedHealthcare) is the top-rated plan for formulary breadth. We reviewed 6 widely available plans across premium cost, deductible, formulary coverage, pharmacy network, and CMS Star Rating. In 2026, the new $2,000 out-of-pocket cap is fully in effect — making plan selection more important than ever.
| Criteria | Weight | Why It Matters |
|---|---|---|
| CMS Star Rating (quality and performance) | High | CMS independently scores every plan on quality measures |
| Premium + deductible combination (annual cost) | High | Real cost includes both — low-premium plans often have high deductibles |
| Formulary coverage (Tier 1–4 drug coverage) | High | If your drugs aren't covered, the plan is worthless |
| Pharmacy network (preferred pharmacy access) | Medium | Preferred pharmacy = 20–50% lower copays |
Data sources: CMS Medicare Plan Finder (plan.medicare.gov), 2026 Medicare and You Handbook, CMS Part D Landscape Summary, KFF Medicare Drug Benefit overview.
The $2,000 out-of-pocket cap is now fully in effect under the Inflation Reduction Act — down from $8,000+ in prior years. This is the most significant Medicare Part D improvement in 20 years.
Insulin is capped at $35/month for all Part D plans.
The 2026 Part D deductible maximum: $590 (some plans have lower or $0 deductibles).
Best for: Enrollees who take few or no regular prescriptions and want minimum cost
Average monthly premium: $9.70
Annual deductible: $590 (maximum)
CMS Star Rating: 3.5 stars
Humana Premier Rx is available in most states and offers one of the lowest monthly premiums in the Part D market. The tradeoff is a full $590 deductible and limited formulary breadth. For Medicare enrollees taking generic medications only who want catastrophic coverage (now capped at $2,000), this plan provides compliant coverage at minimum monthly cost. Always run your specific medications through plan.medicare.gov before choosing — low-premium plans sometimes have higher cost-sharing that exceeds premium savings.
Healthy Medicare enrollees who take few or no regular prescriptions and want protection against catastrophic drug costs. Not the right plan for regular brand-name or specialty medication needs.
Best for: Enrollees with moderate prescription needs who want balanced premium and coverage
Average monthly premium: $33–$68 (varies by state)
Annual deductible: $0–$100 (Tier 1/2 generics exempt on most plans)
CMS Star Rating: 4 stars
SilverScript Plus offers a $0 deductible on most Tier 1 and Tier 2 drugs — generic medications have no deductible before coverage. The CVS pharmacy network (9,900+ locations nationally) is the plan's primary practical advantage, with preferred copay reductions of 20–40%. The 4-star CMS rating reflects above-average quality across member experience and drug coverage accuracy.
Medicare enrollees with regular generic prescription needs who want predictable low costs at CVS. The $0 generic deductible is meaningful for anyone taking 3 or more regular medications.
Best for: Enrollees with multiple prescriptions or brand-name drug needs
Average monthly premium: $68–$105 (varies by state)
Annual deductible: $0–$100 (Tier 1/2 exempt)
CMS Star Rating: 4.5 stars
AARP MedicareRx Preferred has one of the broadest formularies of any national Part D plan — 91% of CMS benchmark drugs covered at Tier 1 or Tier 2 pricing. The 4.5-star CMS rating (highest on this list) reflects strong performance on member satisfaction, drug coverage accuracy, and medication adherence. The Walgreens and Walmart preferred pharmacy network covers 22,000+ locations nationally.
Medicare enrollees on multiple medications, brand-name drugs, or anyone who has had coverage problems with other Part D plans.
Best for: Medicare enrollees who qualify for the Low Income Subsidy (Extra Help)
Average monthly premium: $23–$55 ($0 for Extra Help enrollees)
Annual deductible: $0 for Extra Help enrollees
CMS Star Rating: 3.5–4 stars (varies by region)
Cigna Extra Rx is one of the benchmark plans used for Low Income Subsidy assignment. Extra Help enrollees pay $0 premium and $0 deductible, with drug copays as low as $4.50 (Tier 1) and $11.20 (Tier 2). For Medicare enrollees with incomes below 150% of the Federal Poverty Level, applying for Extra Help through SSA (ssa.gov) is the first action to take before plan comparison. An estimated 1.2 million eligible Medicare enrollees don't claim Extra Help each year.
Medicare enrollees with household income below 150% FPL with limited assets. Apply for Extra Help at ssa.gov.
Best for: Enrollees on generic-only regimens who want a $0 or near-$0 premium plan
Average monthly premium: $0–$6 (select states)
Annual deductible: $590
CMS Star Rating: 3 stars
Wellcare offers $0 or near-$0 premium Part D plans in select states. The $590 deductible applies to all drugs. For enrollees taking 1–2 generics per month at $10–$15/script, the total cost may favor a $0 premium plan over a $30/month premium plan even accounting for the deductible. Run the total cost calculator on plan.medicare.gov to compare your specific situation.
Healthy Medicare enrollees in eligible states who want minimum compliant coverage at zero cost.
Best for: Medicare enrollees in the Midwest who want a regionally strong plan
Average monthly premium: $28–$52
Annual deductible: $0–$100 (Tier 1/2 exempt)
CMS Star Rating: 4 stars
Mutual of Omaha's Part D plan is strongest in Midwest and Plains states and consistently earns 4-star CMS ratings. Their formulary focuses on the most commonly prescribed drug classes for adults 65+ (cardiovascular, diabetes, musculoskeletal) with favorable Tier 1/2 coverage.
Medicare enrollees in Iowa, Nebraska, Kansas, Missouri, and surrounding Midwest states seeking a regionally rooted plan with above-average quality scores.
| Plan | Monthly Premium | Deductible | CMS Stars | Best For |
|---|---|---|---|---|
| Humana Premier Rx | ~$9.70 | $590 | 3.5 | Minimum cost, few prescriptions |
| SilverScript Plus | $33–$68 | $0 generics | 4 | Generic Rx at CVS |
| AARP MedicareRx Preferred | $68–$105 | $0 generics | 4.5 | Complex Rx needs |
| Cigna Extra Rx | $23–$55 ($0 Extra Help) | $0 Extra Help | 3.5–4 | Low-income subsidy |
| Wellcare Value Script | $0–$6 | $590 | 3 | $0 premium, healthy enrollees |
| Mutual of Omaha Rx | $28–$52 | $0 generics | 4 | Midwest enrollees |
Do not pick a plan based on premium alone. A $0 premium plan with a $590 deductible and Tier 3 coverage for your main medication can cost $2,000+ more annually than a $60/month plan with $0 deductible and Tier 1 coverage.
This guide draws on CMS Medicare Plan Finder data, the 2026 Medicare and You Handbook, CMS Part D Landscape Summary, KFF Medicare Drug Benefit analysis, and independent formulary reviews for the 100 most commonly prescribed medications for adults 65+. Plans rated below 3 CMS stars were excluded. Premium ranges reflect national averages — your specific premium depends on zip code. Updated annually during Medicare Annual Enrollment Period (October–December).
Last updated: May 2026.
Initial Enrollment Period (IEP): 7 months around your 65th birthday (3 months before, the month of, 3 months after). Annual Enrollment Period (AEP): October 15 – December 7, for coverage starting January 1. Special Enrollment Periods apply for qualifying events.
If you go without creditable drug coverage when first eligible, you pay a 1% monthly penalty on the national base beneficiary premium for every month delayed — permanently. In 2026 the national base premium is approximately $36.78/month. A 12-month delay adds $4.41/month permanently.
The IRA capped annual Part D out-of-pocket costs at $2,000 in 2026. Once you've paid $2,000 in covered drug costs, your plan covers 100% of additional covered costs for the year. This eliminates the catastrophic coverage gap that previously exposed seniors to $8,000+ annually.
Use the formulary look-up at each plan's website or plan.medicare.gov. Enter your medications by name and dosage to see coverage tier and estimated copay.
Extra Help is a federal program that pays most Part D premiums, deductibles, and copays for Medicare enrollees with limited income and assets. Income limit: approximately $23,000 individual / $30,000 married (varies annually). Apply at ssa.gov or call 1-800-772-1213.
Yes, during the Annual Enrollment Period (October 15 – December 7). Changes take effect January 1. Outside AEP, changes require a qualifying Special Enrollment Period.
Yes. The IRA's $35 insulin cap applies to all Part D plans — all covered insulin products cost no more than $35/month regardless of tier placement.
Yes. Enroll in a low-cost plan or maintain other creditable drug coverage to avoid the late enrollment penalty. Plans starting at $0/month provide compliant coverage at minimal cost until you need benefits.
This content is for informational purposes only and does not constitute medical, legal, or financial advice. Medicare plan availability, premiums, formularies, and coverage vary by geographic area and change annually. Always verify your specific plan and drug coverage at plan.medicare.gov or by calling 1-800-MEDICARE before enrollment. Premium figures are 2026 national averages — your actual premium depends on location.
Author: SeniorSimple Editorial Team. Our editors are Medicare-certified benefits counselors with SHIP (State Health Insurance Assistance Program) training.
Estimate your Medicare costs and compare plan options
Affects IRMAA surcharges for higher earners
Enter your information to see Medicare cost estimates
Claiming Social Security at 62 permanently reduces your benefit by 25–30%. Waiting to 70 increases it by 24–32% above your Full Retirement Age benefit. The break-even age where waiting pays off is typically 78–83 depending on comparison. This guide walks through every scenario with real numbers.
Medicare Supplement Plan G vs Plan N in 2026: Plan G is best for frequent healthcare users; Plan N saves $50-$150/month for healthy seniors. Side-by-side coverage comparison with break-even analysis.
Best Medigap supplemental insurance plans of 2026 for Medicare beneficiaries. Plan G covers everything after a $257 annual deductible. Plan N saves $40-$80/month with small copays. High-Deductible Plan G offers the lowest premium. Full Plan G vs Plan N comparison plus top company rankings.
Get expert insights and practical advice delivered to your inbox weekly.
Join 50,000+ seniors making informed retirement decisions.
