What Is a Medicare Special Needs Plan (SNP)?

A Medicare Special Needs Plan, or SNP, is a type of Medicare Advantage plan that only certain people can join. Medicare describes it as a plan that provides benefits and services to people with specific severe and chronic diseases, certain health care needs, or who also have Medicaid. If you don’t fit one of those groups, you can’t enroll, no matter how good the plan looks.

That’s the main thing to understand. An SNP isn’t a better or worse version of a regular Medicare Advantage plan. It’s the same kind of plan, built around one group of people and open only to them.

What every SNP has in common

According to Medicare.gov, SNPs are either HMO or PPO plan types, and they cover the same Part A and Part B benefits that all Medicare Advantage plans cover. To join one, you need three things:

• Medicare Part A and Part B
• A home address inside the plan’s service area
• Eligibility for the specific type of SNP (more on that below)

Every SNP must include Medicare drug coverage (Part D). CMS says this is because people in these plans need access to prescription drugs to manage their health needs. You don’t add a separate drug plan, and you can’t have an SNP without drug coverage.

SNPs also include care coordination services, and they tailor their benefits, provider choices, and drug lists to the group they serve. In practice, that means the doctors in the network and the drugs on the formulary are chosen with that group in mind. It also means you should check them against your doctors and your prescriptions, because Medicare.gov says whether you can keep your current doctors varies by plan.

The three types

Dual Eligible SNP (D-SNP). For people who have both Medicare and Medicaid. CMS describes D-SNP members as people entitled to Medicare and to medical assistance from a state Medicaid plan. That covers several Medicaid categories, including full Medicaid and the Medicare Savings Programs: Qualified Medicare Beneficiary (QMB), Specified Low-Income Medicare Beneficiary (SLMB), Qualifying Individual (QI), and Qualified Disabled and Working Individual (QDWI). CMS notes that states vary in how they define these categories, so what qualifies you depends on your state. Medicare.gov says that if you have both Medicare and Medicaid, most of your costs will be covered. Your state Medicaid office can tell you what that means for you specifically.

Chronic Condition SNP (C-SNP). For people with a severe or disabling chronic condition. A C-SNP can limit membership to a single chronic condition or a group of related ones. CMS has approved 15 qualifying conditions:

• Chronic alcohol and other drug dependence
• Autoimmune disorders (such as rheumatoid arthritis and lupus)
• Cancer, excluding pre-cancer conditions or in-situ status
• Cardiovascular disorders (such as arrhythmias and coronary artery disease)
• Chronic heart failure
• Dementia
• Diabetes mellitus
• End-stage liver disease
• End-stage renal disease requiring dialysis
• Severe hematologic disorders (such as sickle-cell disease and hemophilia)
• HIV/AIDS
• Chronic lung disorders (such as asthma, emphysema, and pulmonary fibrosis)
• Chronic mental health conditions (such as bipolar disorder and schizophrenia)
• Neurologic disorders (such as Parkinson’s disease, multiple sclerosis, and epilepsy)
• Stroke

The conditions are specific, so a plan will need to confirm that you have a qualifying one. If a plan is built around a combination of conditions, CMS says the plan must verify that you have all of them.

Institutional SNP (I-SNP). For people who, for 90 days or longer, have had or are expected to need the level of care provided in a long-term care facility, such as a skilled nursing facility, a nursing facility, an intermediate care facility for individuals with intellectual disabilities, or an inpatient psychiatric facility. I-SNPs can also enroll people who live at home but need that level of care, but only if an independent third party with the right professional credentials assesses them using the state’s standard evaluation tool. The plan can’t do that assessment itself.

When you can join or switch

Special Needs Plans follow a few enrollment rules that differ from regular Medicare Advantage, and these are where people get tripped up. Medicare.gov lists them under Special Enrollment Periods:

• Chronic condition: If you have a qualifying chronic condition, you can join a C-SNP at any time. But it’s a one-time chance. Medicare says that once you join, your chance to make changes using this special enrollment period ends. You still have the regular enrollment periods, but this one is used up.
• Medicaid or Extra Help: If you have Medicaid or get Extra Help, you can make changes to your coverage once a calendar month, such as switching drug plans or leaving Medicare Advantage for Original Medicare with a standalone drug plan. Changes take effect the first day of the following month. This doesn’t apply if you’ve been identified as at-risk or potentially at-risk under a Part D drug management program.
• Living in an institution: If you live in a nursing home or similar facility, you can join, switch, or drop coverage as long as you live there and for two full months after the month you move out.

There’s a newer rule too. Since January 1, 2025, certain people with full Medicaid benefits can enroll once a month in a highly or fully integrated dual eligible plan, but only when they’re also enrolling in the same company’s Medicaid managed care plan. That’s a narrow pathway, and CMS spells out the details in its implementation guidance.

What people get wrong

Thinking an SNP is a separate kind of Medicare. It isn’t. It’s a Medicare Advantage plan. You still need both Part A and Part B to join.

Assuming it’s free. Medicare.gov says costs vary by plan, and some plans charge a premium in addition to the Part B premium. For people with Medicaid, Medicare.gov says most costs will be covered, but your state Medicaid office can tell you exactly what that means.

Assuming your doctors are in the network. Some SNPs require you to use in-network providers except in emergencies. Others offer out-of-network coverage, usually at a higher cost. Check each doctor, specialist, and pharmacy before you enroll.

Forgetting that eligibility can end. Medicare.gov is direct about this: you can stay in an SNP only if you continue to meet the condition the plan serves. If you lose Medicaid, or your situation changes, you may no longer be able to stay in the plan, though you may qualify for a special enrollment period to pick new coverage. Keep your plan’s notices and respond to them.

Treating the types as interchangeable. Someone with both Medicaid and diabetes might look eligible for a D-SNP or a C-SNP. Each plan serves its own group, with its own network and drug list, so check the plan’s details rather than the label.

How to check what’s available where you live

The Medicare Plan Finder at medicare.gov/plan-compare lets you look at plan types and costs for your ZIP code. SNP availability depends on your county, so a plan you hear about may not be offered where you live. Your State Health Insurance Assistance Program (SHIP) offers free counseling, and your state Medicaid office can answer questions about the Medicaid side of a D-SNP.

Sources: Medicare.gov, “Special Needs Plans (SNP)” (medicare.gov/health-drug-plans/health-plans/your-health-plan-options/SNP); Medicare.gov, “Special Enrollment Periods” (medicare.gov/basics/get-started-with-medicare/get-more-coverage/joining-a-plan/special-enrollment-periods); CMS.gov, “Special Needs Plans” (cms.gov/medicare/enrollment-renewal/special-needs-plans); CMS.gov, “Dual Eligible Special Needs Plans (D-SNPs)” (cms.gov/medicare/enrollment-renewal/special-needs-plans/dual-eligible); CMS.gov, “Chronic Condition Special Needs Plans (C-SNPs)” (cms.gov/medicare/enrollment-renewal/special-needs-plans/chronic-conditions); CMS.gov, “Institutional Special Needs Plans (I-SNPs)” (cms.gov/Medicare/Health-Plans/SpecialNeedsPlans/I-SNPs); CMS.gov, “CY 2025 Integrated Care SEP Implementation Guidance” (cms.gov/files/document/cy2025integratedcaresepimplementationg.pdf).