I-SNP Medicare Plans: Eligibility, Coverage, and How They Work
An Institutional Special Needs Plan (I-SNP) is a type of Medicare Advantage plan that limits enrollment to people who, for 90 days or longer, have needed or are expected to need the level of care provided in a long-term nursing facility. It bundles Part A, Part B, and Part D drug coverage with intensive, on-site care coordination tailored to residents of skilled nursing and similar facilities.
What is an I-SNP?
An Institutional Special Needs Plan (I-SNP) is one of the three types of Medicare Advantage Special Needs Plans (SNPs). CMS defines an I-SNP as a plan that restricts enrollment to Medicare Advantage–eligible people who, for 90 days or longer, have had or are expected to need the level of services provided in a long-term care skilled nursing facility (SNF), a long-term care nursing facility (NF), a SNF/NF, an intermediate care facility for individuals with intellectual disabilities (ICF/IID), or an inpatient psychiatric facility.
Because of that focus, I-SNPs are built around people who live in (or need the care level of) an institution. Many are designed to provide care directly inside the nursing facility, often using nurse practitioners or physician assistants who visit residents on site to catch problems early and reduce avoidable hospital trips. The exact care model, provider network, and extra benefits vary by plan and by insurer.
Who qualifies for an I-SNP
To enroll, you must first be eligible for Medicare Advantage — meaning you have both Medicare Part A and Part B and live in the plan's service area. On top of that, you must meet the institutional level-of-care standard for at least 90 days.
- You must need, or be expected to need, an institutional level of care for 90 days or longer.
- For people living in the community rather than a facility, CMS requires a level-of-care determination using the same state assessment tool used for facility residents.
- That assessment must be performed by an independent, impartial party with the right professional knowledge — the I-SNP cannot own or control the entity doing the assessment.
- Some plans, sometimes called Institutional-Equivalent SNPs (IE-SNPs), serve people who meet the nursing-home level of care but live at home or in an assisted living setting.
What I-SNPs cover
Like other Medicare Advantage plans, an I-SNP must cover everything Original Medicare (Part A and Part B) covers. CMS also requires every SNP — including I-SNPs — to include Medicare Part D prescription drug coverage, so you do not buy a separate drug plan.
All SNPs must provide care coordination, and each member is assigned a care coordinator who helps manage care, providers, and medications. Plans tailor their benefits, provider networks, and drug formularies to the population they serve. Some I-SNPs add extra benefits beyond Original Medicare, but specific extras, networks, and out-of-pocket amounts vary by plan — always confirm them in the plan's official documents before enrolling.
What an I-SNP costs
An I-SNP is still Medicare Advantage, so in 2026 you generally keep paying the standard Part B premium of $202.90 per month (higher earners pay an income-related amount, or IRMAA, on top). Some plans charge an additional monthly premium and some charge $0 — it depends on the plan and your situation.
Because every SNP includes Part D, your drug costs follow Part D rules. In 2026, Medicare caps what you pay out of pocket for covered Part D drugs at $2,100 for the year. The 2026 Part D national base beneficiary premium is $38.99 per month, though the premium you actually pay depends on the specific plan. Many I-SNP members also qualify for Medicaid or the Part D Extra Help (Low-Income Subsidy) program, which can sharply reduce premiums and cost-sharing; eligibility for that is determined separately.
I-SNP vs. C-SNP and D-SNP
There are three kinds of Special Needs Plans, and they qualify people differently:
- I-SNP (Institutional): for people who need an institutional level of care for 90+ days, such as long-term nursing facility residents.
- C-SNP (Chronic Condition): for people with one or more qualifying severe or disabling chronic conditions, such as diabetes or chronic heart failure.
- D-SNP (Dual Eligible): for people who have both Medicare and Medicaid ("dual eligible").
How to join or leave an I-SNP
You can join, switch, or drop a Medicare Advantage plan during the Annual Election Period (October 15–December 7) and during the Medicare Advantage Open Enrollment Period (January 1–March 31). On top of those, people who meet the institutional criteria generally have a Special Enrollment Period that lets them enroll in or change an I-SNP outside the standard windows while they continue to meet the eligibility rules.
If your plan later determines you no longer meet the I-SNP eligibility requirements, it must notify you in writing and you typically get a grace period to regain eligibility or move to another plan. If the grace period ends without action, you can be returned to Original Medicare unless you choose another Medicare Advantage plan. To compare specific I-SNPs in your area and confirm a facility is in network, use the official Plan Finder at Medicare.gov or call 1-800-MEDICARE.
Frequently asked questions
Do I have to live in a nursing home to join an I-SNP?
Not necessarily. The core rule is that you need an institutional level of care for 90 days or longer. Most I-SNP members live in a long-term care facility, but some plans (sometimes called Institutional-Equivalent SNPs) serve people who meet that nursing-home level of care while living at home or in assisted living. For community residents, an independent assessor must confirm the level of care using the state's assessment tool.
Does an I-SNP include prescription drug coverage?
Yes. CMS requires every Special Needs Plan, including I-SNPs, to include Medicare Part D prescription drug coverage, so you do not enroll in a separate drug plan. In 2026, out-of-pocket spending on covered Part D drugs is capped at $2,100 for the year.
Will I still pay the Part B premium with an I-SNP?
Generally yes. An I-SNP is a Medicare Advantage plan, so in 2026 you usually keep paying the standard Part B premium of $202.90 per month (more if you owe IRMAA). The plan may also charge its own premium, or none — it varies by plan. Members with Medicaid or Extra Help may have much of this covered.
What happens if I no longer qualify for the I-SNP?
If the plan determines you no longer meet the eligibility requirements, it must notify you in writing and you typically receive a grace period to regain eligibility or switch plans. If that period ends without action, you can be moved back to Original Medicare unless you enroll in another Medicare Advantage plan.
How is an I-SNP different from a D-SNP?
An I-SNP qualifies people based on needing an institutional level of care for 90+ days. A D-SNP (Dual Eligible Special Needs Plan) qualifies people who have both Medicare and Medicaid. They are separate plan types, though some people who live in facilities also have Medicaid and may have options under either.
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Medicare Login Guide is an independent resource and is not affiliated with or endorsed by Medicare, the Centers for Medicare & Medicaid Services, or any government agency. This article is for general information only — confirm current figures and your specific options at medicare.gov or by calling 1-800-MEDICARE.