Medicare Part D Plans for Seniors: What Everything Costs & How to Pick the Right One

These questions dominate Medicare Part D searches for good reason — most people are either confused about how the program works or aren’t aware of significant changes that affect what they pay. All answers here reflect current program rules.

• 1
  How much does Medicare Part D cost per month? Average national premium: ~$46–$55/month · Range: $0 to $165+/month depending on plan and location · Standard annual deductible: up to $615 · Out-of-pocket cap: $2,100/year (then $0 for the rest of the year)

  Medicare Part D costs have three separate layers that catch most seniors off guard. The monthly premium — which you pay regardless of whether you fill any prescriptions — averages roughly $46–$55/month nationally for stand-alone Part D plans, though this varies enormously by plan and zip code. Some plans, particularly Humana’s $0-premium options, charge nothing monthly in over half of U.S. states. The annual deductible — which you pay before coverage kicks in — can be as high as $615 for 2026, though some plans offer $0 deductibles on lower-tier generic drugs. Then there are the copays or coinsurance per prescription, which depend on which tier your medication falls into. The single most important protection now in effect: once your total out-of-pocket drug costs for the year reach $2,100, you pay absolutely nothing for covered prescriptions for the rest of the calendar year. This hard cap, which did not exist before 2025, is a transformative protection for anyone on high-cost medications. Your monthly premium does not count toward the $2,100 cap — only your actual copays and coinsurance do.
• 2
  What is the most popular Medicare Part D plan for seniors? No single plan is best for everyone — it depends entirely on your specific medications · Top-rated plans nationally: Wellcare (lowest premiums), Humana (most $0-premium options), UnitedHealthcare AARP MedicareRx Preferred (broadest formulary) · Always check your drugs first at medicare.gov/plan-compare

  The search for “the best” Part D plan is the wrong question — and it’s the reason so many seniors end up overpaying. A plan with a $0 premium might charge you $120 for the brand-name drug you take every month. A plan with a $55/month premium might cover that same drug for $8. The only way to know which plan actually costs less for you is to enter your specific list of medications into the Medicare Plan Finder at medicare.gov/plan-compare. That tool calculates your estimated total annual cost — premium plus deductible plus all copays — across every plan available in your zip code. For context on national leaders: Wellcare consistently earns the highest CMS star ratings and lowest average premiums among major carriers in 2026. Humana offers $0-premium plans in more states than any competitor and strong generic drug coverage. UnitedHealthcare’s AARP MedicareRx Preferred covers the broadest formulary but charges above-average premiums — worth it if you take multiple brand-name drugs. SilverScript Choice (Aetna) offers among the lowest monthly costs for seniors primarily on generics. None of these answers matter if your specific drugs aren’t covered, so use the Plan Finder first.
• 3
  Is Humana a good Medicare Part D plan? Yes — for the right person · Humana offers $0-premium plans in more states than any other company · Excellent for generic drug users · Mail-order pharmacy (CenterWell) highly rated · Below-average CMS star ratings in some markets · Verify your specific drugs are on the Humana formulary first

  Humana is one of the most widely available Part D carriers in the country and earns high marks from independent reviewers for out-of-pocket cost management and its mail-order pharmacy experience. The $0-premium plan option — available in over half of U.S. states — is particularly attractive for seniors on primarily generic medications who want to minimize fixed monthly spending. Humana’s mail-order pharmacy, CenterWell, consistently earns strong satisfaction ratings and allows up to 90-day supplies, which lowers per-dose costs and eliminates monthly pharmacy trips. The caution: Humana’s CMS star ratings are below average in some markets — CMS star ratings measure member experience, complaint rates, and care quality, and a 3-star rating vs. a 5-star rating does reflect real differences in how the plan handles coverage disputes and member support. Humana works very well for straightforward generic-medication users. If you take specialty drugs, have complex coverage needs, or anticipate needing to dispute coverage decisions, checking the specific star rating for the Humana plan in your zip code at medicare.gov/plan-compare is important before enrolling.
• 4
  What is the out-of-pocket maximum for Medicare Part D? $2,100 for 2026 — once you hit this amount in covered drug costs, you pay $0 for prescriptions for the rest of the calendar year · The donut hole (coverage gap) no longer exists · You can now spread out-of-pocket costs monthly using the Medicare Prescription Payment Plan

  This is the most important Part D change in the program’s history, and millions of seniors still aren’t fully aware of it. Before 2025, there was no limit on how much a Medicare beneficiary could spend out of pocket on prescription drugs in a year. Some cancer patients and others on specialty drugs paid $10,000–$30,000 or more annually. The Inflation Reduction Act permanently capped that at $2,000 in 2025, adjusted to $2,100 for 2026. Once you reach $2,100 in out-of-pocket drug spending for the year — this includes your deductible and all copays, but not your premium — your cost-sharing drops to zero for every covered drug for the rest of that calendar year. This protection is automatic in every Part D plan; you do not need to apply or take any action. There is also a new option for high-cost drug users to spread their out-of-pocket costs evenly across all 12 months through the Medicare Prescription Payment Plan — rather than paying a large lump sum in January when new prescriptions are first filled. To enroll in this payment smoothing option, contact your Part D plan directly and ask to join the Medicare Prescription Payment Plan (MPPP).
• 5
  What are the worst Medicare Part D plans to avoid? CMS 2-star plans warrant extra caution: AARP/UnitedHealthcare and Blue Cross Blue Shield of IL/MT/OK/NM/TX received 2-star ratings in 2026 · Low star ratings = more complaints, slower appeals, worse member experience · Always check star ratings at medicare.gov before enrolling

  CMS (the federal Centers for Medicare & Medicaid Services) publishes annual star ratings for every Part D plan on a 1–5 scale, measuring things like member satisfaction, how quickly complaints are resolved, and how accurately the plan processes claims. Plans rated 1–2 stars have meaningful real-world problems — not just administrative slowness, but higher rates of denied claims, worse outcomes when members appeal coverage decisions, and lower medication adherence among enrollees. For 2026, AARP MedicareRx plans from UnitedHealthcare received 2 out of 5 stars from CMS — a notable drop for a widely marketed brand. Blue Cross Blue Shield plans in several Midwestern and Southern states also received 2-star ratings. A 2-star rating doesn’t mean all enrollees have a bad experience — but it does mean that when something goes wrong with your coverage, you’re statistically more likely to have difficulty resolving it. The easiest way to avoid bad plans: check star ratings at medicare.gov/plan-compare for every plan you consider in your specific zip code, not just nationally. Star ratings vary by region even for the same insurance company name.
• 6
  What are the 10 Medicare-negotiated drugs and how much did prices drop? Eliquis: $521 → $231/mo (56% off) · Jardiance: $573 → $197 (66% off) · Xarelto: $517 → $197 (62% off) · Januvia: $527 → $113 (79% off) · Entresto, Farxiga, Imbruvica, Enbrel, Stelara, NovoLog/Fiasp also included · 7 of 10 drugs now cost under $100/month

  For the first time in the 60-year history of Medicare, the program directly negotiated prescription drug prices with pharmaceutical companies — and the first results are now in effect. The 10 drugs cover some of the most common conditions in the Medicare population: blood clots (Eliquis, Xarelto), Type 2 diabetes (Jardiance, Januvia, Farxiga), heart failure (Entresto), autoimmune conditions like rheumatoid arthritis and psoriasis (Enbrel, Stelara), blood cancer (Imbruvica), and insulin (NovoLog/Fiasp). The largest percentage reduction: Januvia dropped 79% from $527 to $113 for a 30-day supply. The most financially significant in dollar terms: Eliquis savings of $290 per month add up to $3,480 per year for a single beneficiary. A caveat that real patients are reporting: some individual Part D plans are still charging more than the negotiated Maximum Fair Price at specific pharmacies — a reminder to check your actual EOB (Explanation of Benefits) against the CMS-published negotiated prices if you take any of these 10 medications and feel you’re paying too much. File a complaint through Medicare at 1-800-MEDICARE if your plan charges more than the published negotiated price.
• 7
  What is Medicare Extra Help and who qualifies? Extra Help (also called LIS) pays for your Part D premium, deductible, and caps your drug copays at $5.10 generic / $12.65 brand-name · Worth ~$5,700/year · Income limit: $2,015/month individual ($2,725/couple) · Resource limit: $18,090 individual ($36,100 couple) · Apply through ssa.gov or call SSA

  Extra Help — officially the Part D Low-Income Subsidy (LIS) — is one of the most valuable and most under-claimed benefits in Medicare. The Social Security Administration estimates it is worth approximately $5,700 per person per year. With Extra Help, the federal government pays your Part D plan premium (up to the benchmark amount), eliminates your deductible entirely, and caps your copay at just $5.10 for generic drugs and $12.65 for brand-name drugs — every time you fill a prescription. For the lowest-income enrollees who also have full Medicaid, copays drop even further to $1.60 for generics and $4.90 for brand names. To qualify in 2026, your monthly income must be at or below approximately $2,015 if you’re single or $2,725 for a couple, with assets below $18,090 single or $36,100 for couples. Important: some assets don’t count toward this limit, including your home, one car, personal belongings, and burial funds set aside up to $1,500 per person. If you receive Medicaid, SSI, or are in a Medicare Savings Program, you’re enrolled in Extra Help automatically — no application needed. Otherwise, apply directly at ssa.gov or call 1-800-772-1213. The application takes about 30 minutes and a decision typically comes within a few weeks. Do not assume you don’t qualify without checking — millions of eligible seniors are not enrolled and are overpaying dramatically.
• 8
  When can I change my Medicare Part D plan and what happens if I miss the window? Annual Enrollment Period: October 15 – December 7 · Coverage starts January 1 of the following year · Missed it? Special Enrollment Periods exist for specific circumstances (moving, losing coverage, dual Medicare-Medicaid) · Late enrollment penalty: 1% per month for each month without Part D coverage after you were eligible

  Most Medicare beneficiaries can only change their Part D plan during the Annual Enrollment Period (AEP) — October 15 through December 7 each year. Changes made during this window take effect January 1 of the following year. If you did not change your plan during AEP and your current plan is no longer the best fit, your options outside the enrollment window are limited but not zero. Special Enrollment Periods (SEPs) allow changes when specific life events occur: moving to a new address where your current plan isn’t available, losing employer drug coverage, qualifying for Extra Help, or entering or leaving a nursing home or other care facility. If you have both Medicare and Medicaid, you can change your Part D plan at any time throughout the year. For anyone who delayed enrolling in Part D when first eligible — and who doesn’t have creditable prescription drug coverage from another source — a late enrollment penalty of 1% of the national base beneficiary premium (currently around $37.06/month in 2026) is added to your premium for each full calendar month you went without coverage. This penalty is permanent and added to your premium for as long as you have Part D. The best protection: enroll when first eligible, even if you currently take no medications. A $0-premium plan with minimal coverage protects you from the penalty at essentially no cost.

These are the first 10 medications that Medicare directly negotiated with drug companies — a historic first. The reduced prices took effect January 1 and apply to every enrollee whose Part D plan covers these drugs. If you take any of these, verify your copay has been updated on your current plan.

Plans are only comparable in the context of your specific medications and zip code. Use this table as a starting point — then verify exact costs for your drugs at medicare.gov/plan-compare.

Use the buttons below to find free Medicare counseling, local Social Security offices to apply for Extra Help, pharmacies with Medicare Part D pricing, or Medicare plan comparison events near you. Free SHIP counselors are unbiased — they don’t sell plans and don’t receive commissions.