Most people are familiar with the common Medicare Advantage plan types — HMOs, PPOs, and similar options open to anyone with Medicare in a plan's service area. Special Needs Plans (SNPs) work differently. They are Medicare Advantage plans limited to people who meet specific eligibility criteria and are designed around the circumstances those members share. This guide explains how D-SNPs, C-SNPs, and I-SNPs work, the enrollment rules that apply in 2026, and the changes coming in 2027 that may affect people enrolled in dual-eligible plans.
What Special Needs Plans Are
A Special Needs Plan is a type of Medicare Advantage (Part C) plan that restricts enrollment to people in one of three qualifying groups: those dually eligible for Medicare and Medicaid, those with certain severe or disabling chronic conditions, and those who live in — or need the level of care provided by — an institution such as a nursing facility.
All SNPs share a few common features:
- Part D drug coverage is required. Every SNP must include Medicare prescription drug coverage; you do not enroll in a separate standalone drug plan.
- A model of care. Each SNP must have a CMS-approved model of care describing how it will meet the needs of its population, generally including a health risk assessment at enrollment and an individualized care plan.
- Care coordination. SNPs generally provide care coordinators who help members manage appointments, medications, and specialists — and, in dual-eligible plans, how Medicare and Medicaid work together.
- Standard Medicare Advantage rules otherwise apply. SNPs must cover everything Original Medicare covers, most use provider networks (many are HMOs), and many offer supplemental benefits such as dental, vision, or transportation.
To enroll, you generally must have Medicare Part A and Part B, live in the plan's service area, and meet its special-needs criteria.
D-SNP: Dual Eligible Special Needs Plans
A Dual Eligible Special Needs Plan (D-SNP) is for people who have both Medicare and Medicaid. If you are new to how these programs interact, our guide to how Medicare and Medicaid compare covers the basics.
When you have both, Medicare generally pays first for covered services, and Medicaid may pay second — picking up premiums, deductibles, or cost-sharing depending on your level of Medicaid eligibility:
- Full-benefit dual eligibles qualify for complete Medicaid coverage, which may cover Medicare cost-sharing and services Medicare does not cover, such as long-term care.
- Partial-benefit dual eligibles do not receive full Medicaid benefits but qualify for a Medicare Savings Program that helps pay Medicare premiums and, in some cases, cost-sharing.
Because every D-SNP member has Medicaid, the plan can align benefits, reduce billing confusion, and assign care coordinators who understand both programs. Dual-eligible individuals also generally qualify automatically for Extra Help with Part D, which lowers prescription drug costs.
Some D-SNPs go further and integrate Medicare and Medicaid benefits under a single organization:
- A Fully Integrated Dual Eligible SNP (FIDE SNP) combines Medicare and Medicaid coverage — including Medicaid services such as long-term services and supports — under one company, with one member card and one point of contact.
- A Highly Integrated Dual Eligible SNP (HIDE SNP) offers a similar but somewhat less comprehensive level of integration, with the same parent organization managing both the Medicare plan and a Medicaid plan covering long-term services and supports or behavioral health.
In plain terms: the more integrated the plan, the fewer separate companies and phone numbers you deal with when using both programs.
C-SNP: Chronic Condition Special Needs Plans
A Chronic Condition Special Needs Plan (C-SNP) is for people living with certain severe or disabling chronic conditions. CMS maintains the list of qualifying conditions, which includes among others:
- Diabetes
- Chronic heart failure
- Cardiovascular disease
- Chronic lung disorders, such as COPD
- End-stage renal disease (ESRD) requiring dialysis
Each C-SNP focuses on one condition or a group of related conditions, with benefits generally tailored accordingly — for example, a diabetes-focused C-SNP may feature endocrinologists in its network, a formulary organized around diabetes medications, and disease-specific care management.
Enrollment requires clinician verification. When you apply, the plan generally asks you or your doctor to confirm the qualifying condition — often through a pre-enrollment verification form. If the condition cannot be verified within the required timeframe after enrollment, you may be disenrolled. Having a qualifying diagnosis also generally gives you a Special Enrollment Period to join a C-SNP outside the standard windows.
I-SNP: Institutional Special Needs Plans
An Institutional Special Needs Plan (I-SNP) is for people who either:
- Live in an institution — such as a skilled nursing facility or certain contracted assisted living facilities — and are expected to reside there for 90 days or longer, or
- Need an institutional level of care while living at home, as determined by a state-approved assessment.
I-SNPs generally emphasize on-site care — for example, nurse practitioners who see members regularly where they live — with the goal of catching problems early and reducing avoidable hospital transfers. Many I-SNP members are also dually eligible, since Medicaid is the primary payer for long-term nursing home stays; Medicare itself does not cover long-term custodial care.
Enrollment Rules in 2026
SNP enrollment follows the standard Medicare windows:
- Initial Enrollment Period — the seven-month window when you first get Medicare, whether at 65 or after qualifying for Medicare through a disability.
- Annual Enrollment Period (AEP) — October 15 through December 7, when anyone with Medicare can join, switch, or drop a Medicare Advantage plan, including a SNP.
- Medicare Advantage Open Enrollment — January 1 through March 31, when people already in a Medicare Advantage plan can make one switch or return to Original Medicare.
For dually eligible individuals and people with Extra Help, the old quarterly Special Enrollment Period was eliminated on January 1, 2025 and replaced by two monthly SEPs:
- Monthly dual/LIS SEP — People with Medicaid or Extra Help (LIS) may use this SEP once per month to switch between standalone Part D plans, or to leave a Medicare Advantage plan for Original Medicare plus a standalone drug plan. It is generally not available to individuals identified as "at-risk beneficiaries" under a drug management program.
- Monthly Integrated Care SEP — Full-benefit dually eligible individuals may use this SEP monthly to enroll in, or switch between, integrated D-SNPs aligned with their Medicaid managed care plan.
Neither SEP allows switching between regular, non-SNP Medicare Advantage plans month to month. For a broader look at enrollment windows outside the standard periods, see our guide to Special Enrollment Periods.
What's Changing in 2027
Beginning in 2027, CMS rules will further tighten the alignment between D-SNPs and Medicaid plans:
- Enrollment in certain D-SNPs will be limited to people also enrolled in an affiliated Medicaid managed care organization — meaning your D-SNP and your Medicaid plan may need to be operated by the same or an affiliated company.
- Insurers will face limits on the number of D-SNP benefit packages they can offer in service areas that overlap with their Medicaid plans.
The practical takeaway: some D-SNP enrollees may need their Medicare and Medicaid plans to match in order to stay enrolled. If you are in a D-SNP, watch for notices from your plan and your state Medicaid agency explaining whether you need to take action.
Questions to Ask Before Enrolling
Before joining any SNP, it generally helps to confirm the details that matter most to you:
- Is my Medicaid plan affiliated or aligned with this D-SNP? This matters more each year as integration requirements phase in.
- Are my doctors and specialists in the plan's network? Most SNPs use networks, and going outside them may cost more or not be covered.
- Are my prescriptions on the formulary? Check tier placement and any prior authorization requirements for each drug you take.
- What care coordination is actually provided? Ask how the health risk assessment works, whether you get a named care coordinator, and how the plan handles referrals.
- What happens if my eligibility changes? Ask about the plan's grace period if you lose Medicaid or your qualifying status changes.
How to Get Help and Learn More
SNP eligibility involves both federal and state programs, so free official help can be valuable:
- Medicare.gov — Use the plan finder at Medicare.gov to see which SNPs are available in your area and compare networks and formularies.
- 1-800-MEDICARE (1-800-633-4227) — Medicare's official helpline can explain SNP eligibility and enrollment rules. TTY users can call 1-877-486-2048.
- State Health Insurance Assistance Program (SHIP) — SHIP offers free, unbiased counseling from trained counselors who can help with dual-eligibility questions and plan comparisons. Find your local program at shiphelp.org.
- Your state Medicaid agency — For questions about your Medicaid eligibility level and which Medicaid plans align with local D-SNPs.
- CMS.gov — Policy details on SNP requirements and the 2027 integration rules are published at CMS.gov.
Summary and Next Steps
Special Needs Plans are Medicare Advantage plans built for specific populations, with required drug coverage and care coordination. Key points to remember:
- D-SNPs serve people with both Medicare and Medicaid; Medicare pays first, and Medicaid may cover premiums and cost-sharing depending on your eligibility level
- FIDE and HIDE SNPs integrate Medicare and Medicaid benefits under one organization
- C-SNPs serve people with qualifying chronic conditions such as diabetes or heart failure; enrollment requires clinician verification
- I-SNPs serve people in institutions for 90 days or more, or those needing an institutional level of care at home
- Since January 1, 2025, dual-eligible and Extra Help enrollees have monthly SEPs — one for standalone Part D changes and one for aligned, integrated D-SNPs
- Starting in 2027, certain D-SNPs will require enrollment in an affiliated Medicaid managed care plan
If you think you may qualify for a SNP, start by confirming your eligibility category — Medicaid status, a qualifying chronic condition, or institutional care needs — then compare the plans available in your area on Medicare.gov. A local SHIP counselor can walk through your options at no cost.
