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How much will my prescriptions cost under Medicare Part D in 2026?
Medicare Part D's standard benefit has three phases, and 2026 is the second full year under the Inflation Reduction Act's redesign: a deductible, a coinsurance phase, and then a hard cutoff after which covered drugs cost nothing for the rest of the year. The dollar amounts that define those phases -- the $615 deductible and the $2,100 out-of-pocket cap -- are from CMS's final CY 2026 Part D Redesign Program Instructions. The headline result is simple: $2,100 is the most cash you can be made to pay for covered Part D drugs in 2026, full stop.
The three phases
| Phase | What you pay | When it applies |
|---|---|---|
| Deductible | 100% of the drug's negotiated price, in cash | Until you've spent $615 on covered drugs (2026) |
| Initial coverage | 25% coinsurance, in cash, on every covered drug -- brand or generic | After the deductible, until your cash out-of-pocket total hits $2,100 |
| Catastrophic | $0 -- "the enrollee pays no cost sharing for covered Part D drugs" | For the rest of the calendar year, once you've paid $2,100 in cash |
CMS's own language for the deductible phase: the enrollee "pays 100% of their gross covered prescription drug costs... until the deductible of $615 for CY 2026 is met" (up from $590 in 2025). After that, the enrollee "pays 25% coinsurance for covered Part D drugs" -- the same 25% whether the drug is a brand or a generic. That 25% coinsurance phase continues until out-of-pocket spending reaches the CY 2026 threshold of $2,100 (up from $2,000 in 2025). Past that point, CMS is direct: the enrollee "pays no cost sharing for covered Part D drugs" for the remainder of the year.
Why $2,100 is a real annual cap, not just a phase boundary
Under the Inflation Reduction Act's redesign, the Manufacturer Discount Program (which replaced the old Coverage Gap Discount Program in 2025) is specifically excluded from the out-of-pocket amount that counts toward this threshold -- unlike its predecessor, its 10% manufacturer contribution on brand-name drugs does not count toward the $2,100 cap. That means every dollar counted toward the cap is a dollar you actually paid in cash: the deductible and the 25% coinsurance, nothing else. There's no brand-vs-generic wrinkle here -- a brand-heavy year and a generic-heavy year with the same total drug cost reach the cap at the same point and cost the same cash, because coinsurance is 25% either way and nothing phantom is added to the count. The practical upshot: once your cash spending on covered drugs hits $2,100 this year, you're done paying for the rest of the year, regardless of what drugs you take or how much more they'd otherwise cost.
Worked examples
Take two enrollees with different total drug costs at the plan's negotiated prices, run through the three phases:
| $6,000/yr in drugs | $10,000/yr in drugs | |
|---|---|---|
| Deductible phase: cost / cash paid | $615 / $615 | $615 / $615 |
| Initial coverage: drug cost consumed | $5,385 (all of it) | $5,940 |
| Initial coverage: cash paid (25%) | $1,346.25 | $1,485.00 |
| Hits the $2,100 cap? | No -- stays in 25% coinsurance all year | Yes, at $6,555 of total drug cost |
| Remaining drug cost at $0 | $0 | $3,445 |
| Total cash out-of-pocket | $1,961.25 | $2,100.00 |
The $6,000/yr enrollee never reaches the cap -- every dollar above the deductible costs them 25 cents all year, for $1,961.25 total. The $10,000/yr enrollee hits the $2,100 cap once their total drug cost reaches $6,555 ($615 deductible + $5,940 of 25%-coinsurance drugs); the remaining $3,445 of that year's drugs cost them nothing. No one pays more than $2,100 in cash for covered Part D drugs in 2026, no matter how high their total drug cost runs. Run your own total annual drug cost in the Medicare Part D drug cost calculator.
What this doesn't cover
This is the standard benefit's national model, not your specific plan. Some Part D and Medicare Advantage plans offer better-than-standard coverage (lower deductibles, $0 copays on certain tiers) that gets you to lower cash spending faster; formulary tier placement affects what your plan actually charges before you reach these thresholds; and a handful of drugs are exempt from the deductible under some plans' enhanced benefit designs. The $615 deductible and $2,100 cap are fixed by CMS for every standard and basic Part D plan nationwide in 2026 -- what varies plan to plan is how quickly you get there and what specific drugs cost inside the coinsurance phase.
See also
Part D is one piece of the broader Medicare choice -- Original Medicare vs. Medicare Advantage, and whether your plan has an out-of-pocket maximum at all, is covered in the Medicare Advantage vs. Original Medicare guide. If your Medicare costs are also an income-timing question -- IRMAA adds a Part D surcharge on top of everything above it for higher earners, based on your MAGI from two years ago -- see the IRMAA guide.
The $615 deductible, 25% initial-coverage coinsurance, and $2,100 out-of-pocket cap are all from CMS's final CY 2026 Part D Redesign Program Instructions. This explains the mechanics of the standard benefit, not personalized advice -- your own plan's formulary, deductible-exempt drugs, and enhanced benefit design can change how quickly you get through the phases.