Medicare Special Needs Plans are a category of Medicare Advantage plan that restricts enrollment to people who fit a specific medical or coverage situation. There are three types: C-SNPs for people with certain severe chronic conditions, D-SNPs for people who have both Medicare and Medicaid, and I-SNPs for people living in a nursing facility or requiring nursing-level care at home. Each type must cover everything Original Medicare covers, and all add condition-specific benefits on top. This guide explains how each type works, who qualifies, and what to expect when you enroll.
What makes a Special Needs Plan different
All three SNP types start from the same base as any Medicare Advantage plan: they bundle Part A (hospital) and Part B (outpatient/physician) coverage, almost always include Part D drug coverage, and are offered by private insurers approved by CMS. What sets them apart is the enrollment restriction. Where a standard Medicare Advantage plan is open to any Medicare beneficiary in the plan's service area, a SNP admits only people who meet a specific qualifying criterion.
That restriction is the point. Because the plan's membership is defined by a shared condition or coverage type, the plan can design its benefits specifically for that population. A C-SNP for diabetes can include disease management programs, expanded nutrition counseling, and closer monitoring of kidney function. A D-SNP can coordinate benefits across two programs rather than leaving the member to manage that coordination on their own.
According to CMS, every SNP must also maintain a Model of Care: a documented care management approach reviewed and approved by the National Committee for Quality Assurance (NCQA). The Model of Care requirement means SNPs carry more oversight than standard Medicare Advantage plans.
C-SNPs: Chronic Condition Special Needs Plans
A C-SNP is for people with one or more specific severe, substantially disabling, or life-threatening chronic conditions. CMS publishes a list of qualifying conditions; common ones include:
- Diabetes mellitus (with end organ damage, or insulin-dependent)
- End-stage renal disease (ESRD) requiring dialysis or transplant
- Chronic heart failure
- Dementia (including Alzheimer's disease)
- Chronic lung disorders
- Cardiovascular disorders
- HIV/AIDS
- Autoimmune disorders
- Certain cancers
Each C-SNP specifies one or more of these conditions. A plan called a "diabetes C-SNP" enrolls only people whose records confirm that diagnosis; it will not enroll someone with a different qualifying condition unless it also covers that condition. Before you can join, the plan verifies your qualifying diagnosis, typically through a review of medical records or an attestation from your physician.
The extra benefits a C-SNP provides go beyond what standard Medicare Advantage plans offer and target the enrolled condition directly. A heart failure C-SNP might include remote cardiac monitoring, dietitian visits, or home telemonitoring equipment. An ESRD C-SNP might include transportation to dialysis, more frequent care coordination, or waived cost-sharing for dialysis-related services.
Standard cost-sharing rules still apply: C-SNP enrollees pay the Part B premium ($202.90/month standard in 2026) plus any plan premium, and face the plan's deductibles and copays for covered services. Many C-SNPs set low or zero copays for the condition-specific services the plan is designed around.
D-SNPs: Dual Eligible Special Needs Plans
A D-SNP is for people who qualify for both Medicare and Medicaid, a group CMS calls "dually eligible." According to CMS, there are two groups:
- Full-benefit duals have Medicare plus full Medicaid coverage.
- Partial-benefit duals have Medicare plus help only through a Medicare Savings Program (QMB, SLMB, or QI), but not full Medicaid.
D-SNPs generally require full Medicaid coverage, though some accept partial duals. Confirm the plan's Medicaid requirement before applying.
The three D-SNP integration tiers
Not all D-SNPs coordinate Medicare and Medicaid to the same degree. CMS recognizes three integration levels, defined by how tightly the Medicare and Medicaid benefits are joined:
| Tier | Name | What it means |
|---|---|---|
| Basic | Coordination-Only D-SNP | The plan coordinates with Medicaid but holds only a Medicare contract. Medicaid services remain managed separately through the state or a separate Medicaid managed care plan. |
| Middle | HIDE-SNP (Highly Integrated Dual Eligible SNP) | The plan's parent organization holds both a Medicare contract and a Medicaid managed care contract in the same service area. Coverage is more integrated but may not include long-term services and supports (LTSS). |
| Highest | FIDE-SNP (Fully Integrated Dual Eligible SNP) | The plan's parent organization holds a capitated Medicaid contract covering primary care, acute care, behavioral health, and Medicaid LTSS, with Exclusively Aligned Enrollment. Both programs are billed and managed through a single plan. |
A FIDE-SNP is the most integrated option available. For the mechanics of FIDE-SNPs, including the regulatory definition under 42 CFR 422.2 and how they differ from standard D-SNPs, see the FIDE-SNP guide.
The Integrated Care Special Enrollment Period
Effective January 1, 2025, a new rule created the Integrated Care Special Enrollment Period (SEP). Under this SEP, full-benefit dual-eligible individuals can enroll in a D-SNP in any calendar month, rather than only during the standard Annual Enrollment Period or limited SEP windows. This is a significant change for people who qualify mid-year or who need to switch plans outside of the usual fall open enrollment. Partial-benefit duals do not qualify for this SEP.
What D-SNP enrollment means for costs
Most full-benefit duals enrolled in a D-SNP pay $0 in monthly plan premium (beyond the Part B premium, which Medicaid typically pays through a Medicare Savings Program) and $0 in most medical cost-sharing. Drug copays follow the Low-Income Subsidy schedule: $0-$1.55 for generics and $0-$4.60 for brand drugs in 2026, depending on the specific program tier. For more on how Medicare and Medicaid coordinate, see the dual-eligibility guide.
I-SNPs: Institutional Special Needs Plans
An I-SNP is for people who live in an institution or who require nursing-care-level services. CMS defines two qualifying tracks:
- Institutional residents. You live in a skilled nursing facility (SNF), nursing facility, intermediate care facility for individuals with intellectual disabilities (ICF/IID), or inpatient psychiatric facility.
- Institutional-equivalent. You live at home or in another community setting but require nursing-care-level services. Qualifying is determined through an assessment, usually conducted by the plan or a state-designated agency.
I-SNPs are less common than C-SNPs and D-SNPs, and availability varies significantly by region. In some markets they are the primary coverage option for long-stay nursing facility residents; in others, very few plans exist.
Because I-SNP members typically have high medical complexity, the plans often provide intensive care coordination, including dedicated care managers, structured care transitions when moving between settings (hospital to SNF to home), and oversight of medication regimens that can run to a dozen or more drugs simultaneously.
Unlike a standard Medicare Advantage plan, which can at most cover 100 days of skilled nursing per benefit period under the same rules as Original Medicare, an I-SNP is built around members for whom the nursing facility is their permanent residence. The plan's design reflects that: it coordinates with facility staff directly rather than treating the facility as an episodic care destination.
Enrollment: how to get into a SNP
All three SNP types share the same enrollment mechanics as Medicare Advantage, with the additional step of verifying your qualifying criteria.
Step 1: Confirm you have Part A and Part B. Every SNP requires both. If you don't have Part B, you can't join.
Step 2: Verify you meet the plan's specific criteria. For a C-SNP, that means your diagnosis is on the plan's qualifying list. For a D-SNP, that means you have the required level of Medicaid coverage. For an I-SNP, that means you reside in a qualifying institution or meet the institutional-equivalent threshold.
Step 3: Check plan availability in your county. Not every SNP type is available in every county. Use Medicare Plan Finder to search SNPs in your area, filter by SNP type, and compare benefits.
Step 4: Enroll during an eligible window. The standard enrollment windows apply (Initial Enrollment Period, Annual Enrollment Period in fall), plus any SEPs for which you qualify. Full-benefit duals can use the Integrated Care SEP to enroll in a D-SNP any month.
Step 5: Confirm your qualifying criteria documentation. Some plans require medical records, a physician's attestation, or Medicaid eligibility verification. Have those ready when you apply.
What SNPs must cover
By regulation, every SNP must cover all Medicare Part A and Part B services that Original Medicare covers. There are no gaps in the base benefit relative to Original Medicare. On top of that, each SNP must offer supplemental benefits specific to its enrolled population.
SNPs must also include Part D drug coverage as part of the plan's benefit package, unless the plan is structured as a Medicare-only plan (uncommon for SNPs). That means most SNP members get their drug coverage through the same plan, not through a standalone Part D plan added separately.
What a SNP cannot do is use the membership restriction to cover less than Original Medicare. The restriction governs who gets in, not what coverage they receive once enrolled.
Frequently asked questions
Yes. During an eligible enrollment window, you can switch from any Medicare Advantage plan to a SNP, provided you meet the qualifying criteria. If you're a full-benefit dual-eligible, the Integrated Care SEP lets you make that switch in any month.
A C-SNP covers all medically necessary Part A and Part B services, regardless of which condition they relate to. The qualifying condition is the basis for enrollment, not a restriction on coverage once you're in. The supplemental benefits are condition-specific, but the base Medicare coverage is complete.
If you no longer meet the qualifying criteria, the plan must disenroll you. You'll receive a Special Enrollment Period to join another Medicare coverage option. For D-SNP members who lose Medicaid, the plan must notify you and CMS, and you'll have time to find alternative coverage.
For full-benefit duals, a D-SNP generally simplifies things by coordinating the two programs and reduces administrative work. A FIDE-SNP goes further by putting both under one plan. Whether a particular D-SNP is "better" depends on the plan's network, quality ratings, and how well it integrates Medicaid services in your state. Check CMS star ratings at Medicare Plan Finder before deciding.
No. SNPs are a type of Medicare Advantage, and Medigap policies cannot be used with any Medicare Advantage plan. You'd need to drop the SNP and return to Original Medicare to use Medigap.
Learn More
- Medicare overview: Parts A, B, C, and D explained
- Dual eligibility: having both Medicare and Medicaid
- Fully Integrated Dual Eligible Special Needs Plans (FIDE-SNPs)
- Original Medicare vs. Medicare Advantage: which is right for you
Find personalized help comparing Medicare Special Needs Plans at brevy.com.
The information on Brevy.com is for educational purposes only and is not a substitute for professional legal, financial, or medical advice. Rules vary by state and program and change frequently. Always verify with the relevant agency or a qualified professional. Brevy is not a law firm, financial advisor, or healthcare provider.