Medicare Special Needs Plans: How C-SNPs and I-SNPs Work
Special Needs Plans are Medicare Advantage plans built for one group of people: those with certain chronic conditions, those who live in a nursing home or need that level of care, or those who also have Medicaid. Here is who qualifies and how to join.
A Medicare Special Needs Plan (SNP) is a Medicare Advantage plan that only enrolls people in one group. There are three kinds. C-SNPs are for people with certain severe or disabling chronic conditions, such as diabetes, heart failure or dementia. I-SNPs are for people who live in a nursing home or similar facility, or who need that level of care at home. D-SNPs are for people who have both Medicare and Medicaid. Every SNP includes Part D drug coverage and care coordination, and you need Part A and Part B and must live in the plan's service area to join.
SNPs work like other Medicare Advantage plans. They cover everything Original Medicare covers, usually through a provider network, and many add extra benefits. The difference is that the plan's doctors, drug list and care coordination are built around the group it serves. This guide focuses on C-SNPs and I-SNPs. Dual-eligible plans have their own rules, covered in our guide to D-SNP enrollment rules.
The three types of Special Needs Plans
| Type | Who can join | Based on |
|---|---|---|
| C-SNP (Chronic Condition) | People with a severe or disabling chronic condition the plan targets | Your diagnosis, confirmed by your doctor |
| I-SNP (Institutional) | People living 90 days or longer in a nursing home or similar facility, or living at home but needing that level of care | Where you live or the care you need |
| D-SNP (Dual Eligible) | People with both Medicare and Medicaid | Your Medicaid eligibility |
Medicare says every SNP must include Part D prescription drug coverage. Every SNP must also coordinate your care, which usually means you get a care coordinator or care team who helps line up doctors, medicines and follow-up visits. If you are in a SNP, you can stay only while you still meet the plan's rules.
C-SNPs: plans for chronic conditions
A C-SNP can focus on one condition, such as diabetes, or on a group of related conditions. To join, you need a condition the plan is approved to serve. Having a chronic illness in general is not enough.
The qualifying conditions changed for 2026
For years, CMS used a list of 15 conditions. In an April 2024 final rule, CMS replaced it with a longer list of 22 condition categories. CMS said plans built on the new list could start with 2026 coverage. CMS's own C-SNP web page still shows the older list of 15, so the rule text is the better guide. The new categories are:
- Heart and blood vessels: chronic heart failure; cardiovascular disorders (cardiac arrhythmias, coronary artery disease, peripheral vascular disease, valvular heart disease); stroke.
- Diabetes and metabolism: diabetes; overweight, obesity and metabolic syndrome.
- Kidneys and digestion: chronic kidney disease, with or without dialysis (this replaces the old ESRD-only category); chronic gastrointestinal disease, including chronic liver disease, fatty liver disease, hepatitis B and C, pancreatitis, irritable bowel syndrome and inflammatory bowel disease.
- Lungs: asthma, chronic bronchitis, COPD, cystic fibrosis, emphysema, pulmonary fibrosis and pulmonary hypertension.
- Brain and nerves: dementia; conditions with cognitive impairment, including Alzheimer's disease, mild cognitive impairment and traumatic brain injury; neurologic disorders such as ALS, epilepsy, multiple sclerosis, Parkinson's disease, polyneuropathy, spinal stenosis, fibromyalgia and chronic fatigue syndrome.
- Mental health and substance use: bipolar disorder, major depression, schizophrenia, schizoaffective and paranoid disorders, PTSD, anxiety disorders and eating disorders; alcohol and other substance use disorders.
- Immune and blood disorders: autoimmune disorders (such as rheumatoid arthritis, lupus, psoriatic arthritis and scleroderma); severe blood disorders (such as sickle-cell disease, hemophilia and aplastic anemia); HIV/AIDS; immunodeficiency and immunosuppressive disorders; cancer.
- Function and senses: conditions with functional challenges such as paralysis, limb loss, spinal cord injury and arthritis; chronic conditions that impair vision, hearing, taste, touch or smell; conditions that need ongoing therapy to keep functioning; care after an organ transplant.
A condition being on this list does not mean a plan for it exists near you. Most C-SNPs serve a few common conditions. CMS also lets plans combine linked conditions in approved groups, for example diabetes with chronic heart failure, or chronic kidney disease with kidney transplant care. In a CMS-approved group you need only one of the conditions to join.
How the plan confirms your condition
A C-SNP has to verify your diagnosis with your current doctor, physician assistant or nurse practitioner. Under the federal rule it can do this in one of two ways:
- Before you enroll. The plan contacts your provider's office and gets confirmation first.
- With a pre-enrollment assessment. You answer questions about your history, symptoms and medicines, and the plan lets you enroll. Your provider then has to sign off by the end of your first month in the plan.
If the plan uses the second route and cannot get your provider's confirmation in time, it must send you a notice within the first 7 days of your second month and disenroll you at the end of that month. If your provider confirms before then, you stay. To avoid a gap in coverage, tell your doctor's office that a plan may contact them, and follow up if you get a letter.
I-SNPs: plans for nursing home level care
I-SNPs serve people whose health needs are at the level of a long-term care facility. Federal rules describe two groups:
- Institutionalized: you live, or are expected to live, for 90 days or longer in a skilled nursing facility, Medicaid nursing facility, intermediate care facility for people with intellectual disabilities, psychiatric hospital, rehabilitation hospital, long-term care hospital or swing-bed hospital.
- Institutionalized-equivalent: you live in the community, for example at home or in assisted living, but need an institutional level of care. An assessment confirms this.
Plans come in three types that match those groups. A facility-based I-SNP serves residents of specific nursing homes it contracts with. An institutional-equivalent I-SNP serves people living in the community. A hybrid I-SNP serves both. CMS notes that members of facility-based plans get most of their care at the facility where they live, so ask how the plan provides doctor visits there.
CMS says that well over 95% of people in facility-based I-SNPs also have Medicaid. If a parent is moving into a nursing home, check whether Medicaid will help pay with our long-term care Medicaid eligibility estimator. You can also see what Medicare itself covers in a skilled nursing stay with the skilled nursing facility coverage calculator.
When you can join or leave a SNP
| Situation | What you can do | When |
|---|---|---|
| Anyone with Medicare | Join, switch or drop a Medicare Advantage plan, including a SNP | Annual Enrollment Period, October 15 to December 7, for coverage starting January 1 |
| You have a severe or disabling chronic condition | Join a C-SNP that serves your condition, if one is available in your area | Any time. The special enrollment period ends once you join. |
| You live in, or recently moved out of, an institution such as a nursing home | Join, switch or drop a Medicare Advantage plan or drug plan, or return to Original Medicare | As long as you live there, and for 2 full months after the month you move out |
| You no longer qualify for your SNP | Join another Medicare Advantage plan or a drug plan | Starts the month you lose special needs status. Ends when you join a new plan or 3 calendar months after the SNP disenrolls you. |
The institution rule is especially useful for families. When a parent moves into a nursing home, you do not have to wait for fall to move them into an I-SNP that works with that facility, or out of a plan the facility does not take. Our Medicare enrollment period finder shows which windows apply to you.
Is a Special Needs Plan right for you?
A SNP can be a good fit when a single condition or care setting drives most of your health care. It may be a poor fit if your current specialists are not in its network. Before you join, check:
- Your doctors and hospital. Most SNPs use networks. Confirm that your specialists, and for an I-SNP the nursing home itself, are in the plan.
- Your medicines. Look up every prescription on the plan's drug list and check the tier and any prior authorization rules.
- Total costs. Compare the premium, the out-of-pocket maximum and copays for the care you use most. Some SNPs also lower the Part B premium. See how the Part B giveback works.
- What happens if you stop qualifying. If you leave a facility or your diagnosis changes, you will need a new plan.
If you have not yet decided between the two Medicare paths, compare Medicare Advantage and Original Medicare first. A SNP is only available on the Medicare Advantage side, and you cannot use one together with a Medigap policy.
How to find SNPs in your area
- Search Medicare Plan Finder. Enter your ZIP code at medicare.gov/plan-compare and look for plans labeled as Special Needs Plans. You can also call 1-800-MEDICARE (1-800-633-4227) and ask which SNPs serve your county.
- Ask the plan which conditions or facilities it serves. A C-SNP lists the conditions it covers. An I-SNP can tell you which nursing homes it works with.
- Talk to your doctor's office. They can confirm your diagnosis for the plan and tell you whether they take it.
- Get free help. A SHIP counselor can compare SNPs with you at no cost and with no sales pitch.
Frequently Asked Questions
Do Special Needs Plans include drug coverage?
Yes. Medicare requires every Special Needs Plan to include Part D prescription drug coverage, so you do not buy a separate drug plan.
Can I join a C-SNP outside the Annual Enrollment Period?
Yes. If you have a severe or disabling chronic condition and a C-SNP for that condition serves your area, you can join at any time of year. This special enrollment period ends once you join, so you cannot keep switching between C-SNPs with it.
What happens if the plan cannot confirm my condition?
When a C-SNP enrolls you based on a pre-enrollment assessment, your own doctor, physician assistant or nurse practitioner has to confirm the condition by the end of your first month. If that does not happen, the plan must send you a notice within the first 7 days of the second month and disenroll you at the end of the second month. If confirmation arrives before then, you stay enrolled.
Does my parent have to live in a nursing home to join an I-SNP?
Not always. Some I-SNPs are for people who live, or are expected to live, in a nursing home or similar facility for 90 days or longer. Others are for people who live at home but need a nursing home level of care, confirmed by an assessment. Ask each plan which group it serves.
Is a Special Needs Plan the same as Medicaid?
No. A Special Needs Plan is a type of Medicare Advantage plan. Only one kind, the D-SNP, is limited to people who also have Medicaid. C-SNPs and I-SNPs are based on health condition or where you live, not on income, although many I-SNP members also have Medicaid.
What if I stop qualifying for my SNP?
The plan will notify you. You get a special enrollment period that starts the month you lose your special needs status and lets you join a different Medicare Advantage plan or a drug plan. It ends when you join a new plan or 3 calendar months after the plan disenrolls you, whichever comes first.
This article explains Medicare Special Needs Plan rules as of October 2026. Which SNPs are offered, the conditions they serve and the facilities they work with vary by county and change each year. This is general educational information, not insurance or medical advice. See our disclaimer. Confirm plan details with the plan, Medicare (1-800-MEDICARE) or your State Health Insurance Assistance Program (SHIP).