Medicare Part D: How to Lower Your Prescription Costs in 2026
Medicare Part D is prescription drug coverage for Medicare beneficiaries. It's confusing by design -- the coverage phases, formulary tiers, and annual changes make it one of the most complex parts of the healthcare system. This guide breaks it all down for 2026 and shows you how to minimize what you pay. For non-Medicare savings strategies, see our prescriptions without insurance guide.
How Part D Works in 2026
Part D has four coverage phases. Here's what they look like after the Inflation Reduction Act changes:
Phase 1: Deductible ($590 in 2026)
You pay 100% of drug costs until you've spent $590. Some plans waive the deductible for certain drug tiers (especially Tier 1 generics). If your plan covers generics without a deductible, you skip this phase for those drugs.
Phase 2: Initial Coverage ($590 to $2,000 out-of-pocket)
After the deductible, you pay copays or coinsurance for your drugs. The exact amount depends on your plan's formulary tier:
| Tier | Drug Type | Typical Copay |
|---|---|---|
| Tier 1 | Preferred generics | $1-$10 |
| Tier 2 | Non-preferred generics | $10-$20 |
| Tier 3 | Preferred brands | $35-$50 |
| Tier 4 | Non-preferred brands | 25-50% coinsurance |
| Tier 5 | Specialty drugs | 25-33% coinsurance |
Phase 3: The $2,000 Annual Cap (NEW in 2025)
This is the biggest change from the Inflation Reduction Act. Once your out-of-pocket spending reaches $2,000 in a calendar year, you pay $0 for all covered drugs for the rest of the year. Previously, there was no cap, and patients with expensive drugs could pay $10,000+ annually.
The Medicare Prescription Payment Plan (NEW)
Starting in 2025, Medicare beneficiaries can spread their out-of-pocket costs evenly across the year. Instead of paying $2,000 in the first few months (when expensive drugs hit the deductible), you can opt into monthly installments. This is essentially an interest-free payment plan for your drug costs.
The Insulin Cap: $35/Month
The Inflation Reduction Act capped insulin copays at $35/month for all Medicare Part D plans. This applies to all covered insulin products, regardless of formulary tier. For insulin-dependent patients, this is a significant savings — some were previously paying $100+ per month in copays.
How to Lower Your Part D Costs
1. Switch Plans During Open Enrollment
Medicare Open Enrollment runs October 15 - December 7. This is your annual opportunity to switch to a plan that better covers your medications. Use the Medicare Plan Finder tool (medicare.gov/plan-compare) to enter your specific drugs and find the lowest-cost plan.
This single step can save hundreds per year. Plans change their formularies and copays annually, so a plan that was cheapest last year may not be cheapest this year.
2. Apply for Extra Help (Low-Income Subsidy)
If your income is below 150% of the federal poverty level (~$22,590 for individuals in 2026) and your assets are below $17,220, you may qualify for Extra Help — a federal program that dramatically reduces Part D costs:
- $0 or reduced monthly premium
- $0 or reduced deductible
- Copays of $4.50 for generics and $11.20 for brand drugs
- No donut hole/coverage gap
Apply through Social Security (ssa.gov) or your state Medicaid office. An estimated 2 million eligible beneficiaries don't apply.
3. Use Generics on the $4 List
For cheap generics, the cash price at Walmart ($4) or Costco ($2-4) may be lower than your Part D copay. You can pay cash for some drugs and use Part D for expensive drugs. However, cash payments don't count toward your $2,000 cap.
Read our insurance vs. cash price guide for the full analysis.
4. Ask About Tier Exceptions
If your medication is on a high copay tier, your doctor can request a "tier exception" — asking the plan to cover it at a lower tier. This requires medical justification (e.g., you've tried lower-tier alternatives and they didn't work).
Medicare Drug Price Negotiation
The Inflation Reduction Act gave Medicare the power to negotiate prices on select drugs for the first time. The first 10 drugs subject to negotiation (starting in 2026) include Eliquis, Jardiance, Xarelto, Januvia, and others. Negotiated prices are expected to be 25-60% lower than current prices.
Here's what the negotiated prices look like for the most widely prescribed drugs on the list:
| Drug | Condition | Previous Part D Cost (est.) | Negotiated Price (est.) | Savings |
|---|---|---|---|---|
| Eliquis | Blood clots | $521/month | $231/month | 56% |
| Jardiance | Diabetes | $573/month | $197/month | 66% |
| Xarelto | Blood clots | $517/month | $197/month | 62% |
| Januvia | Diabetes | $527/month | $113/month | 79% |
| Entresto | Heart failure | $628/month | $295/month | 53% |
These negotiated prices apply at the point of sale, meaning your copay or coinsurance is calculated on the lower price. Combined with the $2,000 annual cap, patients on these drugs will hit the cap later in the year -- or potentially never reach it at all.
This is just the beginning. Medicare will negotiate prices on 15 additional drugs in 2027, 15 more in 2028, and 20 per year starting in 2029.
For more on how these drugs are priced and what alternatives exist, see our most expensive prescriptions guide.
Part D vs. Discount Cards for Seniors
Can you use GoodRx or SingleCare as a Medicare beneficiary? Yes — but with important caveats:
- Discount card purchases don't count toward your $2,000 cap
- For cheap generics, discount cards may save $5-10 per fill vs. Part D copays
- For expensive drugs, always use Part D to reach the $2,000 cap faster
- You cannot use manufacturer copay cards with Medicare (federal law)
The strategic approach: Use Part D for expensive medications (to hit the $2,000 cap quickly), and consider cash/discount cards for cheap generics where Part D copays are higher. Check our discount card comparison.
For the health science context behind many commonly prescribed Medicare drugs, Health Britannica covers senior health and supplement options.
Patient Assistance Programs for Medicare Patients
Many manufacturer PAPs exclude Medicare patients, but some offer separate programs. Additionally, non-profit foundations like PAN Foundation, HealthWell Foundation, and Good Days provide copay assistance specifically for Medicare beneficiaries. See our PAP guide for details.
Annual Savings Math: A Real-World Example
Let's walk through a realistic scenario. Margaret, 72, takes four medications daily:
- Eliquis (blood thinner) -- previously ~$521/month, now ~$231/month after negotiation
- Atorvastatin 20mg (cholesterol) -- Tier 1 generic, $3 copay
- Lisinopril 20mg (blood pressure) -- Tier 1 generic, $3 copay
- Omeprazole 20mg (acid reflux) -- Tier 1 generic, $5 copay
Under the old system (pre-2025), Margaret's Eliquis alone could have cost $3,000-$6,000+ annually out of pocket once she hit the donut hole. Under the 2026 rules, her out-of-pocket spending hits the $2,000 cap around month 8, and she pays $0 for the rest of the year. Meanwhile, her three generic copays total $11/month -- but at Costco, she could pay $2-3 each in cash, saving another $3-5/month.
Margaret's optimized annual drug cost: roughly $2,132 -- down from a potential $7,000+ just two years ago.
Key Takeaways
- The $2,000 annual cap is the single biggest improvement to Medicare drug coverage in decades. If you take expensive medications, this saves you thousands.
- Use the Medicare Prescription Payment Plan to spread costs across the year instead of front-loading them in January and February.
- Always compare your Part D copay against the cash price at Costco or Walmart for cheap generics. You might save $5-10 per fill.
- Apply for Extra Help if your income is under ~$22,590. An estimated 2 million eligible people leave this money on the table.
- Switch plans every year during Open Enrollment. Formularies change, and last year's best plan may not be this year's best plan.
- Watch for negotiated drug prices -- the list of covered drugs will grow annually through 2029 and beyond.
Frequently Asked Questions
What is the Medicare donut hole in 2026?
The traditional "donut hole" (coverage gap) has been effectively eliminated by the $2,000 annual out-of-pocket cap. Previously, beneficiaries would hit a coverage gap where they paid a higher percentage of drug costs. Now, once you reach $2,000 in out-of-pocket spending, all covered drugs cost $0 for the rest of the year.
Can I use GoodRx with Medicare Part D?
Yes, but discount card purchases don't count toward your Part D deductible or $2,000 out-of-pocket cap. Use discount cards only for cheap generics where the cash price is lower than your Part D copay. For expensive drugs, always use Part D to reach the $2,000 cap.
How do I find the best Part D plan for my medications?
Use the Medicare Plan Finder at medicare.gov/plan-compare. Enter your medications (drug name, dose, quantity) and pharmacy preference. The tool calculates your estimated annual cost under each available plan, including premiums, deductibles, and copays. Do this every year during Open Enrollment (Oct 15 - Dec 7) because plan costs and formularies change annually.
Does the $2,000 cap include my Part D premium?
No. The $2,000 out-of-pocket cap only counts your deductible, copays, and coinsurance at the pharmacy. Monthly premiums are separate and do not count toward the cap. When comparing plans, factor in both the premium cost and expected out-of-pocket drug costs to find the true lowest total.
What happens if my drug isn't on my Part D plan's formulary?
If your medication is not on your plan's formulary, you have three options: (1) ask your doctor for a covered alternative, (2) request a formulary exception through your plan -- your doctor will need to provide medical justification, or (3) switch to a plan that covers your drug during Open Enrollment. In the meantime, check if Cash prices at Costco or Cost Plus Drugs are affordable while you sort out coverage.
Can I enroll in Part D if I missed Open Enrollment?
Outside Open Enrollment (Oct 15 - Dec 7), you can only enroll during a Special Enrollment Period triggered by qualifying events -- losing other drug coverage, moving to a new service area, qualifying for Extra Help, or leaving employer coverage. If you delay enrollment without creditable drug coverage, you may face a late enrollment penalty of 1% per month added to your premium permanently.
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