compare part d plans carefully and you can change what you spend on prescriptions next year. Medicare drug coverage is not standardized the way Medigap is. Every plan builds its own drug list, its own pharmacy network, and its own copay structure. Two plans sold in the same ZIP code can treat the identical medication very differently. One may cover it on a low tier with no restrictions.
Another may push it to a specialty tier or require prior authorization. That difference falls entirely on the beneficiary. Roughly 360 stand-alone drug plans are offered across the 34 Part D regions in 2026, according to KFF analysis. Most people can only choose from 8 to 12 of them locally. Choosing well takes an hour. Choosing poorly can cost far more.
What Part D Actually Costs in 2026
The Inflation Reduction Act rebuilt the Part D benefit, and 2026 is the second year under the new structure. The old coverage gap, commonly called the donut hole, is gone. In its place sits a hard annual cap on what enrollees pay out of pocket for covered drugs. For 2026, CMS set that threshold at $2,100, up from $2,000 in 2025 because of an inflation adjustment. Once spending reaches it, covered prescriptions cost nothing for the rest of the year.
Federal law also caps the deductible any plan may charge. In 2026 no Part D plan may set a deductible above $615. Some plans charge nothing. Many charge the full amount but only on higher tiers. This detail matters because a plan with a large deductible and low copays can beat a plan with no deductible and high copays, depending entirely on which drugs someone takes.
Enrollees also have the option of the Medicare Prescription Payment Plan. It spreads out-of-pocket drug costs into monthly payments across the calendar year instead of large charges at the pharmacy counter. It does not lower the total owed. However, it helps people who hit their deductible in January and cannot absorb a single large bill. Every Part D plan must offer it.
How to Compare Part D Plans Step by Step
The official tool is the Medicare Plan Finder at Medicare.gov. It is free, it is run by CMS, and it uses real plan data filed with the government. Start by entering a ZIP code. Then enter every prescription taken, including dosage and quantity. This step is the one most people skip, and skipping it makes the results nearly meaningless. The tool then ranks plans by estimated total yearly cost rather than by premium alone.
Total annual cost is the number that matters. Add twelve monthly premiums, the deductible, and expected copays or coinsurance across the year. The cheapest premium in a region frequently produces one of the highest total costs. For example, a low-premium plan may place a common brand-name drug on tier 4 with 40% coinsurance. A slightly pricier plan may cover the same drug on tier 3 with a flat copay.
| What to check | Why it matters |
|---|---|
| Formulary coverage | An uncovered drug costs full retail and does not count toward the cap |
| Tier placement | Lower tiers carry flat copays; higher tiers often use percentage coinsurance |
| Deductible | Some plans apply it only to tiers 3 and above |
| Pharmacy status | Preferred pharmacies typically charge less than standard in-network ones |
| Utilization rules | Prior authorization, step therapy, and quantity limits delay access |
| Star rating | CMS rates plans 1 to 5 on service and accuracy |
| Mail order | 90-day supplies often cost less than three retail fills |
When you compare Part D plans on Plan Finder, the tool flags coverage restrictions next to each drug. Read those flags. A plan can technically cover a medication while requiring the prescriber to submit paperwork before the first fill.
Formularies, Tiers, and Pharmacy Networks
Every plan sorts covered drugs into tiers. Tier 1 usually holds preferred generics and carries the smallest copay. Tier 2 covers other generics. Tier 3 typically holds preferred brands. Tier 4 covers non-preferred brands. Tier 5, the specialty tier, holds high-cost drugs and almost always uses coinsurance instead of a fixed copay. Moving one drug from tier 3 to tier 5 can change annual spending dramatically.
Pharmacy networks create a second layer of variation. Most plans from carriers such as UnitedHealthcare, Humana, Aetna, Cigna, Blue Cross affiliates, and Mutual of Omaha designate certain pharmacies as preferred. Filling at a standard in-network pharmacy instead costs more, sometimes substantially. Rural beneficiaries should verify that a preferred pharmacy is actually within driving distance before enrolling.
Plans can change formularies during the year, though CMS restricts how and when. Members must receive advance notice of most negative changes. Anyone already stabilized on a drug generally keeps coverage through the plan year. As a result, the annual review still matters. When you compare Part D plans each fall, check whether the current plan moved any medication to a higher tier for the coming year.
What to Do Next and Where to Get Free Help
Medicare Open Enrollment runs October 15 through December 7 every year. Changes made during that window take effect January 1. The plan must receive the request by December 7. Outside that period, most people cannot switch without a qualifying special enrollment period, such as moving out of a plan’s service area or losing employer drug coverage.
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Read the Annual Notice of Change that arrives from the current plan each September. It lists next year’s premium, deductible, tier structure, and formulary changes. Then compare Part D plans against that baseline rather than assuming the existing plan stays competitive. Plan availability shifted considerably for 2026, with the number of stand-alone drug plans dropping about 22% from the prior year, so some enrollees were moved automatically.
Free unbiased counseling exists in every state through the State Health Insurance Assistance Program, known as SHIP. Counselors are trained volunteers who do not sell insurance and earn no commission. They will sit down and compare Part D plans alongside the beneficiary. Medicare’s helpline at 1-800-MEDICARE operates around the clock. AARP and many public libraries also host enrollment events each fall.
People with limited income and resources should apply for Extra Help, also called the Low-Income Subsidy. Applications go through the Social Security Administration and are free. Extra Help reduces premiums, deductibles, and copays, and recipients never owe a late enrollment penalty. Anyone enrolled in Medicaid, Supplemental Security Income, or a Medicare Savings Program qualifies automatically.
Frequently Asked Questions
Do I need Part D if I take no prescriptions?
In most cases, yes. Going 63 days or more without creditable drug coverage triggers a permanent late enrollment penalty. That penalty adds 1% of the national base beneficiary premium for every uncovered month and follows you for life.
Is the plan with the lowest premium the cheapest option?
Rarely. Premium is only one of four cost components, alongside deductible, copays, and pharmacy pricing. When people compare Part D plans by total yearly cost instead of premium, the ranking often reverses completely.
How often should I review my drug plan?
Every single year. Formularies, tiers, networks, and premiums all change annually, and so do prescriptions. Reviewing during Open Enrollment takes under an hour on Medicare.gov and requires no commitment to switch.
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Official Sources & Resources
For verified information on Medicare regulations and consumer protection:
- Medicare.gov (Official Site): medicare.gov
- CMS (Centers for Medicare & Medicaid Services): cms.gov
- NAIC (National Association of Insurance Commissioners): naic.org
- KFF Medicare Research: kff.org/medicare
- Social Security Administration: ssa.gov
Content last reviewed July 2026. If you notice any outdated information, please contact us.