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Medicare I-SNP plans for nursing home residents in Sioux Falls 2026: Sanford's Great Plains plans explained

Two plans, one carrier, zero CMS ratings — and the only Medicare Advantage option designed specifically for people who live permanently in a long-term care facility.

Big Sioux Benefits Data Desk

Published July 7, 2026 · 10 min read · Sourced from CMS.gov

Medicare's Institutional Special Needs Plans — I-SNPs — are the one type of Medicare Advantage plan built specifically for people who live permanently in a nursing home or long-term care facility. In Sioux Falls for 2026, only one carrier offers I-SNPs: Sanford Health, through its Great Plains Medicare Advantage contract (H1787), with two options at different premium and deductible levels. Understanding these plans is critical for residents, families, and facility discharge planners who are navigating Medicare coverage for long-term care.

Every figure below comes from public federal data — the CMS PY2026 Medicare Advantage landscape, CMS 2025 Parts A & B cost-sharing, Medicaid enrollment data, and CMS Hospital Compare. No invented numbers; verify plan details and eligibility with a licensed agent or Medicare.gov.

What is a Medicare I-SNP — and who can join?

I-SNP stands for Institutional Special Needs Plan. Like all Special Needs Plans (SNPs), it's a type of Medicare Advantage plan with a targeted enrollment population — in this case, people who permanently reside in a nursing home, skilled nursing facility, or other long-term care setting, or who have chronic conditions requiring institutional-level care.

The key distinction from other Medicare Advantage plans: you must qualify institutionally to enroll in an I-SNP. Someone in the community recovering from hip surgery — even if they're temporarily in a skilled nursing facility — is not eligible. I-SNPs are designed for permanent long-term care residents, and they're built around that reality: the plan's network, care coordination, and cost structure reflect the needs of people receiving care in a facility, not from home.

For context, Sioux Falls' 39,532 Medicare beneficiaries can choose from 11 Medicare Advantage plans — but only 2 of those are I-SNPs, and both require nursing home residency.

The 2 Great Plains I-SNP plans in Sioux Falls for 2026

Both 2026 I-SNPs in Minnehaha County come from Sanford Health under the Great Plains Medicare Advantage HMO contract. Here's the full plan roster:

Source: CMS Medicare Advantage / Part D Landscape (PY2026) & CMS Medicare Advantage & Part D Star Ratings (2026), Minnehaha County, PY2026.

Compare the two plans' premium and deductible trade-off:

I-SNPs vs. D-SNPs: the key differences for dual-eligible residents

Many nursing home residents are dual-eligible — they have both Medicare and Medicaid. This means they may see marketing for both D-SNPs (Dual-Eligible Special Needs Plans) and I-SNPs. They're not the same:

Source: CMS Medicare Advantage / Part D Landscape (PY2026); CMS SNP model of care requirements.

In practice: if a nursing home resident is dual-eligible AND lives in Sanford's Great Plains service area, an I-SNP may offer care coordination more tailored to facility-based care than a D-SNP. If the resident is dual-eligible but NOT in the Great Plains service area, a D-SNP (which covers all 51 counties in South Dakota for the PPO D-SNPs) is the Special Needs Plan option. Confirm the specific plan's service area and facility participation before enrolling.

What Medicare pays for skilled nursing facility care — and where the gap falls

Understanding I-SNPs starts with understanding what Original Medicare does and doesn't cover in a nursing facility. The coverage is time-limited and has significant daily cost-sharing after day 20:

Source: CMS 2025 Medicare Parts A & B Premiums and Deductibles (Fact Sheet) (2025 figures; verify current year at Medicare.gov).

The core exposure for long-term care residents: once they've been in a skilled nursing facility for more than 100 days, Original Medicare covers nothing. Medicaid steps in for those who qualify (and South Dakota has 122,936 Medicaid enrollees as of February 2026), but the daily coinsurance from days 21–100 — $204/day — can add up even before the 100-day limit.

An I-SNP, as a Medicare Advantage plan, replaces this structure with its own cost-sharing schedule and sets an annual out-of-pocket maximum on medical spending. Whether that's better or worse than Original Medicare for a specific resident depends on their Medicaid status, their daily care needs, and the plan's specific cost-sharing schedule — which is why reviewing the plan's Evidence of Coverage (EOC) document with a licensed agent is essential.

The Sanford network — and what it means for Great Plains I-SNP members

Both Great Plains I-SNP plans are HMO plans — meaning they require members to use the plan's network for covered services (except emergencies). That network is built around Sanford Health, the Sioux Falls-based health system that holds a 5-star CMS Hospital Compare rating at its flagship facility:

Source: CMS Hospital Compare — Overall Star Ratings.

For nursing home residents, the network question manifests differently than for community-dwelling beneficiaries. The primary concern isn't "can I see my primary care doctor" — it's whether the facility itself is part of the plan's network. An I-SNP can only cover care in network-participating long-term care facilities. Before enrolling, the facility's business office should confirm it accepts Great Plains I-SNP patients. If it doesn't participate in the network, the plan cannot be used there.

Residents who need hospitalization will typically be transported to Sanford USD Medical Center — a 5-star facility. Those who prefer Avera McKennan Hospital (4★) or the Sioux Falls VA Medical Center (5★) should confirm those facilities' network participation before enrolling in an HMO I-SNP.

The unrated-plan risk: what a missing star rating means

CMS requires a plan to have enough enrollment and claims history before it can publish an Overall Star Rating. Both Great Plains I-SNP plans are new contracts for 2026 — they show no rating yet, which the CMS stability-tier framework classifies as:

"Unrated" doesn't mean bad. Every plan starts unrated. But it does mean you're choosing without the primary quality signal CMS publishes — and it means CMS can't yet flag the plan for below-average performance. The practical advice: plan to check the CMS October 2026 star rating release, which will reflect 2026 performance and inform the 2027 plan year. If the plan scores below 3★ at that first rating, it's a signal to re-evaluate during the Annual Enrollment Period (October 15–December 7).

The single-carrier concentration compounds this: with only one carrier offering I-SNPs statewide, there's no competing I-SNP to switch to if Great Plains exits a county or exits the market. For nursing home residents who can't easily move to a different facility, that concentration risk deserves attention every year at AEP.

I-SNP coverage across South Dakota: 23 counties, 1 carrier

Statewide, South Dakota's I-SNP coverage is the most limited of any Medicare plan type in the 2026 landscape:

Source: CMS Medicare Advantage / Part D Landscape (PY2026), statewide SD 2026.

I-SNPs cover 23 of South Dakota's 66 counties — compared to D-SNPs which cover 51 counties and stand-alone Part D plans which cover all 66. If a nursing home resident lives in one of the 43 counties without Great Plains I-SNP coverage, I-SNP enrollment isn't an option. Original Medicare (with Medicaid coverage for qualifying dual-eligible residents) remains the primary coverage pathway in those areas.

For residents at facilities in the 23 covered counties, the critical practical step is verifying the facility participates in the Great Plains HMO network — not just that the county is covered. County coverage means the plan operates there; facility participation means the plan will actually pay for care at that specific address.

How the 2026 Part D cap applies to I-SNP residents

The Part D drug coverage under both Great Plains I-SNP plans is subject to the same 2026 cap that applies to all Medicare drug coverage: $2,100 out-of-pocket maximum per year. Once a resident's covered drug spending reaches that cap, cost-sharing drops to $0 for the rest of the calendar year.

The two plans diverge sharply on the deductible — the amount you pay before the Part D coverage kicks in:

• Standard plan (H1787-001, $12/mo): Full $615 Part D deductible. Residents pay full price for covered drugs until they've spent $615 for the year, then the plan's cost-sharing kicks in.
• Gold plan (H1787-002, $72/mo): $0 deductible. Drug coverage begins from day 1, with no upfront spending required before the plan pays its share.

For residents on multiple maintenance medications — common in long-term care settings — the Gold plan's $0 deductible means immediate access to the plan's drug tier pricing, without the first-$615 spend. The $720 annual premium premium difference between the plans ($60/mo × 12) versus a $615 deductible: if a resident consistently reaches the deductible before mid-year, the Gold plan's math tends to favor out.

Matching I-SNP coverage to the health conditions driving LTC admissions

Nursing home residents reflect — and exceed — the health burden of the general Medicare population. CDC PLACES 2023 data shows the chronic-condition prevalence in the county from which most Sioux Falls LTC residents come:

Source: CDC PLACES: Local Data for Better Health, County 2023 (2023), Minnehaha County adults. Nursing home residents typically have higher prevalence rates than the general county population.

Coronary heart disease (5.5%), COPD (5.6%), and cancer (8.0%) are conditions that commonly drive nursing home admissions and sustained skilled care needs. The drug formulary coverage for conditions at the top of this list — hypertension (31.7%), diabetes (10.0%), arthritis (22.9%) — determines a resident's out-of-pocket drug costs under either Great Plains plan. Bring the full medication list to any plan review.

What to watch heading into 2027

1. CMS October 2026 star rating release. October is when CMS publishes the 2027 plan year star ratings. Both Great Plains I-SNP plans will receive their first ratings then. A score of 4★ or above signals strong performance; below 3★ for a first-year plan is a meaningful watch signal.
2. Annual Enrollment Period: October 15 – December 7. This is the window to switch plans. If the October star ratings raise concerns, this is the time to act — switches take effect January 1.
3. Confirm facility network participation annually. Long-term care facilities renegotiate plan contracts each year. Before AEP closes, the facility's billing office should confirm Great Plains I-SNP participation for 2027.
4. Monitor Medicaid coordination. For dual-eligible residents, how the I-SNP coordinates with Medicaid may change as CMS continues tightening integration requirements for D-SNPs and I-SNPs. Residents who are also Medicaid-eligible should review the SNP's Model of Care coordination practices annually.
5. Track county footprint changes. Sanford's Great Plains contract currently covers 23 counties. If the carrier expands or contracts its service area in 2027, residents near county boundaries may see their options change.

How we know all this: Big Sioux Benefits runs every article through a data desk that cross-references the CMS plan landscape, county enrollment, 2026 star ratings, hospital quality data, and CMS cost-sharing schedules — built by Strategic AI Architects. Every figure here comes from a public federal dataset. This is education, not advice; confirm plan eligibility, facility network participation, costs, and Medicaid coordination with a licensed agent or Medicare.gov. We take no payment from any carrier to feature a plan.