How Medicare Part D Works in 2026: Phases, Caps and Costs
Part D is private prescription drug coverage with a heavily redesigned cost structure since 2025: the notorious coverage gap is gone, replaced by a hard $2,000 out-of-pocket cap. Understanding the year’s phases — deductible, initial coverage, catastrophic — is the difference between picking a plan that fits and one that shocks you in February.
| Phase | 2026 rule | What you pay |
|---|---|---|
| Deductible (if the plan has one) | Up to $615 federal max | Full negotiated price until met |
| Initial coverage | After deductible / from $1 | Fixed copays or ~25% coinsurance by tier |
| Out-of-pocket cap | $2,000 in 2026 (indexed yearly) | Nothing more for covered drugs after cap |
| Catastrophic phase | Automatic after the cap | $0 — plan + Medicare pay everything |
| Premium | Plan-set, ~$36–40 average | Paid monthly regardless of usage |
What the $2,000 cap changes
Before 2025, specialty drug users could owe five figures inside the coverage gap. Now the worst covered-drug year is $2,000 out of pocket plus premiums — one of the biggest consumer protections in Medicare’s history. The cap counts only plan formulary drugs bought through the plan’s pharmacy network; costs outside the plan (some exclusives, import orders) do not count toward it.
How to actually shop a Part D plan
Use Medicare.gov’s Plan Finder with your exact drug list and preferred pharmacy — total annual cost (premium + deductible + tier copays) varies wildly by plan, and the cheapest-premium plan is rarely the cheapest-total plan for anyone on branded drugs. Re-shop every fall: formularies and tiers churn each January, and last year’s winner routinely becomes this year’s loser.
FAQ
Is the $2,000 cap per drug or total?
Total — it is a calendar-year ceiling across all your covered Part D drugs combined.
Does everyone pay a Part D deductible?
No — many plans have none, or apply the deductible only to higher tiers. The $615 figure is a maximum plans may charge.
Can the cap rise in future years?
Yes — the $2,000 figure is indexed; the 2026 number reflects that adjustment.
Related reading: Phase-by-phase file · Late penalty · IRMAA surcharge · Enrollment windows