Prescription Costs & Part D
When will I hit the $2,100 Medicare drug cap?
Last reviewed: · Big Sioux Benefits Data Desk
It depends entirely on what your drugs cost, and the range is enormous. Someone taking one expensive brand-name drug can reach the $2,100 out-of-pocket cap within the first few months of the year. Someone taking only common generics may never reach it, because a full year of those prescriptions can cost less than a single month of a brand-name specialty drug.
The qualifier: this is arithmetic on your specific prescriptions, not a rule of thumb, and the drugs Medicare beneficiaries actually take sit at wildly different price points. CMS publishes what Part D spends per claim for every drug, and the spread between a common statin and a common anticoagulant is roughly a hundredfold. That is why two people on the same plan can have completely different years.
What Part D actually spends per prescription
| Drug | Average Part D spending per claim | Medicare users |
|---|---|---|
| Atorvastatin (generic cholesterol) | $10.75 | 18.5 million |
| Metformin (generic diabetes) | $8.93 | 5.8 million |
| Eliquis (blood clots) | $399.01 in Q1 2026, down from $912.31 in 2025 | 3.9 million |
| Ozempic (type 2 diabetes) | $1,302.82 | 2.0 million |
Reading that table against the cap: at roughly $10 a fill, a year of atorvastatin will not come close to $2,100 in total cost, let alone in your share of it. At Ozempic's per-claim figure, total drug costs pass $2,100 quickly, and your own out-of-pocket share reaches the cap within the first several months. Two things change the math in your favor, and both are worth checking before you assume the worst: negotiated prices cut the underlying cost of ten widely used drugs starting January 1, 2026, and Extra Help replaces the whole structure with fixed dollar amounts for those who qualify.
Sources
- CMS — Medicare Part D Spending by Drug — CY2025 full year and CY2026 Q1 files; accessed 2026-08-21
- CMS — Announcement of Calendar Year 2026 Medicare Advantage Capitation Rates and Part C and Part D Payment Policies (Part D benefit parameters) — CY2026 parameters; accessed 2026-08-21
- Medicare.gov — Costs for Medicare drug coverage — accessed 2026-08-21
Related questions
If I reach the cap in April, do I really pay nothing for the rest of the year?
For covered drugs under your Part D benefit, yes: your cost sharing goes to $0 for the remainder of the calendar year once your out-of-pocket total reaches $2,100. You still owe your monthly plan premium, and the counter resets on January 1.
Do my spouse and I share one $2,100 cap?
No. The out-of-pocket threshold applies per person, not per household. Each of you has your own $2,100 limit under your own drug coverage, even if you are on identical plans.
Drug costs turn on your specific prescriptions, so the arithmetic is worth doing once, properly: book a free, no-pressure conversation, see your county's South Dakota plan lineup, or browse all answers. SHIINE, the state's free counseling program, is at 1-800-536-8197 and sells nothing.
Big Sioux Benefits is a licensed insurance agency, not affiliated with or endorsed by the U.S. government or the federal Medicare program. We do not offer every plan available in your area. Contact Medicare.gov, 1-800-MEDICARE, or SHIINE (South Dakota's SHIP) for all of your options.