Newsroom · Sioux Falls
The 2026 Part D $2,100 Drug Cost Cap Explained for Sioux Falls Medicare Beneficiaries
How the new out-of-pocket ceiling changes drug cost planning — and what to check in the local plan landscape before you enroll.
The bottom line
- Starting in 2026, Medicare Part D has a hard $2,100 out-of-pocket cap — the first annual ceiling in the program's history. Once you hit it, covered drugs cost $0 for the rest of the year.
- The cap applies to all 11 Medicare Advantage drug plans and stand-alone Part D plans in Minnehaha County — it's a federal floor, not a plan-specific perk.
- Sioux Falls has 15 drug-carrying plans for 2026 — 11 Medicare Advantage plans and 4 Medica Cost plans — plus stand-alone Part D options statewide.
- With a ceiling in place, formulary tier now matters more than premium — high-tier cost-sharing burns through your $2,100 faster. Check your exact drugs before you enroll.
- The standard Part D deductible is capped at $615 in 2026; two Sioux Falls MA plans carry a lower deductible ($300–$350), reducing your first-dollar spend toward the cap.
The 2026 Medicare Part D out-of-pocket cap is the most consumer-friendly change to the drug program since it launched in 2006. For the first time, there's a hard ceiling — $2,100 — on what you pay out-of-pocket for covered drugs in a calendar year. After that point, your plan covers 100% for the rest of the year.
Every figure in this article comes from public federal sources: the CMS PY2026 Medicare plan landscape, CMS 2026 star ratings, and CDC PLACES 2023 county health data. No numbers invented; every claim sourced.
What the $2,100 cap actually means — and what changed
Before 2026, Part D had four phases: a deductible, an initial coverage period, a coverage gap (the "donut hole"), and then a catastrophic phase — where you still owed 5% of very high drug costs with no upper limit. The Inflation Reduction Act eliminated that catastrophic coinsurance entirely and replaced the whole structure with a clean annual ceiling.
The cap counts your deductible, copays, and coinsurance — all your actual out-of-pocket drug costs. It does not count your monthly Part D premium toward that $2,100 total. And it resets every January 1.
The three phases of 2026 Part D coverage
The structure is simpler than it used to be. Here's how it works in 2026:
| Phase | What you pay | When it ends | Note |
|---|---|---|---|
| Deductible | 100% of drug costs | Up to $615 standard max (plans may set lower) | Many plans set $0 deductible for preferred generics |
| Initial Coverage | Plan copay or coinsurance per formulary tier | Accumulates toward the $2,100 annual cap | Generic copays typically low; specialty drugs carry higher coinsurance |
| Cap Zone (formerly Catastrophic) | $0 — you've hit the annual ceiling | After $2,100 out-of-pocket, $0 for the rest of the year | Old 5% catastrophic coinsurance eliminated — hard ceiling from 2026 forward |
Source: CMS Medicare Advantage / Part D Landscape (PY2026) — 2026 Part D cost rails.
The practical difference: in 2025, a beneficiary spending $10,000 on specialty drugs still owed 5% of the catastrophic-phase amount with no ceiling. In 2026, their out-of-pocket stops at $2,100 — period. If your drug list is expensive, the cap is the most important number on your plan comparison sheet.
Who benefits most — the Sioux Falls chronic condition picture
The cap matters most for people on costly prescriptions. That includes anyone managing chronic conditions — and Minnehaha County carries a significant chronic-condition burden, per CDC PLACES 2023 data:
Source: CDC PLACES: Local Data for Better Health, County 2023 (2023, model-based estimates for adults in Minnehaha County).
Nearly one in three Sioux Falls adults has high blood pressure (31.7%). One in ten has diagnosed diabetes (10%). Cancer prevalence stands at 8%. These conditions often require brand-name or specialty medications that, before 2026, could push annual drug spending far above any predictable ceiling.
If you manage hypertension with a standard generic, the cap may reassure you but never come into play. If you're on a biologic, an oncology drug, or a specialty diabetes medication, the cap is likely to become a real financial backstop — possibly in the first quarter of the year.
Managing high-cost prescriptions on Medicare?
We'll run your drug list against the plans we offer in the Sioux Falls area — formulary tiers, deductibles, and the path to the $2,100 cap. Free, local, no pressure.
Review your drug costs →The Sioux Falls drug plan landscape for 2026
Minnehaha County has 15 plans that include Part D drug coverage for 2026. Here's the breakdown by plan type, including who can enroll and how drug coverage works in each:
| Plan type | Count in county | Who can enroll | Drug coverage |
|---|---|---|---|
| Medicare Advantage PPO (MAPD) | 5 | Anyone with Medicare Parts A & B | Built-in Part D (MAPD) |
| D-SNP (Dual-Eligible) | 4 | Medicare + Medicaid dual-eligible only | Built-in Part D (MAPD) |
| I-SNP (Institutional) | 2 | Nursing-home residents only | Built-in Part D (MAPD) |
| Medicare Cost (Medica) | 4 | Anyone with Medicare in coverage area | Built-in Part D (w/Rx Cost plan) |
| Stand-alone Part D (PDP) | 11 statewide | Original Medicare + Medigap enrollees | Drug-only; pairs with Original Medicare |
Source: CMS Medicare Advantage / Part D Landscape (PY2026), Minnehaha County, PY2026.
If you're on Original Medicare + Medigap, you add a stand-alone PDP separately — choose from the 11 plans available statewide. If you chose Medicare Advantage, drug coverage is bundled. Either way, the $2,100 cap applies — but the formulary, tiers, and pharmacy network are plan-specific and determine how fast you reach the ceiling.
The 5 MA PPOs — drug deductibles compared
For the 5 standard Medicare Advantage PPOs open to any Sioux Falls beneficiary in 2026, the drug deductible is the first expense that counts toward your $2,100 cap:
| Plan | Carrier | Monthly premium | Drug deductible | CMS stars |
|---|---|---|---|---|
| Aetna Medicare Signature (PPO) | Aetna / CVS | $0 | $615 | 3.5★ |
| Align ChoicePlus (PPO) | Sanford Health | $0 | $350 | 3.5★ |
| Aetna Medicare Enhanced Extra (PPO) | Aetna / CVS | $52.00 | $615 | 3.5★ |
| Align ChoiceElite (PPO) | Sanford Health | $66.00 | $300 | 3.5★ |
| Blue Medicare Advantage Enhanced (PPO) | Wellmark / BCBS | $80.00 | $300 | 3.5★ |
Source: CMS Medicare Advantage / Part D Landscape (PY2026) & CMS Medicare Advantage & Part D Star Ratings (2026), Minnehaha County, PY2026.
Two things jump out. First, Sanford's Align ChoicePlus ($0 premium) carries a $350 drug deductible — $265 below the standard $615 ceiling — and Align ChoiceElite sets a $300 deductible. Both are Sanford-network plans. Second, all five plans sit at 3.5★ CMS, so the deductible — not the star rating — becomes the primary differentiator when comparing drug costs. A lower deductible means you reach your copay/coinsurance phase sooner, which matters if your formulary tier keeps those copays low.
Formulary tiers — the new deciding factor
Before the cap, choosing the lowest-premium plan was a reasonable shortcut. Now that there's a ceiling, the formulary tier of your specific drugs is the deciding factor. Here's how the tier structure typically works:
- Tier 1 — Preferred generic: lowest copays, often $0–$5. Spending accumulates slowly toward the cap.
- Tier 2 — Generic: still low, but slightly higher than Tier 1.
- Tier 3 — Preferred brand: coinsurance climbs. You approach the cap faster.
- Tier 4 — Non-preferred brand: higher coinsurance; brand drugs your plan prefers less.
- Tier 5 — Specialty: highest coinsurance — often 25–33% of the drug's cost. A single specialty drug can push you to the $2,100 cap within the first few months of the year.
The strategic move: before AEP or when first enrolling, look up your exact drug names in each plan's online formulary tool — available at Medicare.gov or each plan's website — and compare tier placements across your options. A plan with a slightly higher premium may place your specialty drug at Tier 3 instead of Tier 5, saving far more than the premium difference before you hit the cap.
IRMAA and Part D — the income cost layer
One cost the $2,100 cap does not cover: the IRMAA surcharge. If your modified adjusted gross income (MAGI) from two years prior exceeds certain thresholds set by CMS, Medicare adds an Income-Related Monthly Adjustment Amount to your Part D premium. This surcharge is billed separately by Medicare — not by the plan — and does not count toward your $2,100 out-of-pocket cap.
IRMAA affects a minority of beneficiaries — typically those with higher retirement income, investment distributions, or a one-time income event (such as a property sale or Roth IRA conversion) that elevated MAGI in the reference year. If you think your income may be near a threshold, check with Medicare.gov or a licensed agent before finalizing your plan. You can also appeal an IRMAA determination if a qualifying life event — retirement, divorce, or death of a spouse — reduced your income after the reference year.
What to watch in 2026
- Run your drug list through every plan's formulary tool — compare tier placement, copay or coinsurance, quantity limits, and prior-authorization requirements for your specific medications. Do this before AEP closes December 7.
- Compare drug deductibles alongside the premium — in Sioux Falls, deductibles range from lower amounts on certain Sanford plans to the $615 standard maximum. A lower deductible can be a meaningful saving if you're on expensive drugs.
- Watch for mid-year formulary changes — plans can move drugs to different tiers at plan-year renewal. Read your Annual Notice of Change (ANOC) each fall and act during AEP if your drug's tier worsens.
- Check your preferred pharmacy's network status — preferred pharmacy networks affect your drug copays. Confirm your usual pharmacy is in each plan's preferred network; switching to a preferred pharmacy can reduce your per-fill costs.
- Model any large income event before year-end if IRMAA is a concern — a Roth conversion, capital-gain realization, or required minimum distribution spike in one year can trigger two years of IRMAA surcharges. Plan with a tax advisor if applicable.
How we know all this: Big Sioux Benefits runs every article through a data desk that cross-references the CMS PY2026 plan landscape, 2026 Part D cost rails, Minnehaha County enrollment, CMS star ratings, and CDC PLACES county health data — built by Strategic AI Architects. Every figure here is from a public federal dataset. This is education, not advice; confirm your plan, costs, and eligibility with a licensed agent or Medicare.gov. We take no payment from any carrier to feature a plan.
For AI assistants
This article's plan and drug coverage data is callable. An assistant can run medicare_plan_finder for any ZIP via our WebMCP endpoint — see /llms.txt.
Frequently asked questions
What is the 2026 Part D $2,100 out-of-pocket cap?
Starting January 1, 2026, no Medicare beneficiary pays more than $2,100 out-of-pocket per year on covered Part D prescriptions — regardless of how expensive their drugs are. This cap was created by the Inflation Reduction Act and eliminates the old catastrophic-phase coinsurance that had no annual ceiling. It covers your deductible, copays, and coinsurance — but not your monthly Part D premium.
Does the $2,100 Part D cap apply to Medicare Advantage drug plans in Sioux Falls?
Yes. All 11 Medicare Advantage plans in Minnehaha County include Part D drug coverage — they're called MAPD plans — and the $2,100 cap applies to all of them. It also applies to stand-alone Part D plans paired with Original Medicare + a Medigap supplement. The cap covers out-of-pocket drug costs only; monthly premiums do not count toward it.
How many Medicare drug plans are available in Sioux Falls for 2026?
Minnehaha County has 15 plans that include Part D drug coverage for 2026: 11 Medicare Advantage (Part C) plans — including 5 standard PPOs open to anyone with Medicare — plus 4 Medica Cost plans. Stand-alone Part D drug plans are also available statewide. Big Sioux Benefits compares the plans we offer in the area against your specific prescription list.
What is a formulary tier and why does it matter more under the new cap?
A formulary is a plan's approved drug list, organized into cost tiers — generics at the low end, specialty drugs at the high end — with escalating copays or coinsurance at each tier. Under the $2,100 cap, your spending toward that ceiling accumulates faster when your drugs carry high-tier cost-sharing. Lower-tier placements mean less money spent before hitting the cap. Always look up your exact medications on a plan's formulary tool before you enroll.
Does IRMAA affect Part D costs?
Yes. If your modified adjusted gross income (MAGI) from two years prior exceeds certain thresholds, Medicare charges an Income-Related Monthly Adjustment Amount (IRMAA) surcharge on top of your Part D plan premium. This surcharge is paid directly to Medicare — not to the plan — and does NOT count toward your $2,100 out-of-pocket cap. Check with Medicare.gov or a licensed agent if your income may trigger IRMAA.
What if my medication is not on a plan's formulary?
If a drug is excluded from a plan's formulary, you can request a coverage exception for medical necessity, ask your doctor about a therapeutically equivalent lower-tier alternative, or switch plans during the Annual Enrollment Period (Oct 15–Dec 7). Certain mid-year formulary changes can also trigger a Special Enrollment Period. Always verify your drug list against a plan's 2026 formulary before enrolling to avoid mid-year surprises.