Medicare Advantage Special Needs Plans
Medicare Special Needs Plans Explained: D-SNP, C-SNP and I-SNP
Medicare Special Needs Plans are Medicare Advantage plans designed for specific groups of beneficiaries. The three main types are D-SNPs for people with Medicare and Medicaid, C-SNPs for people with qualifying chronic conditions, and I-SNPs for people who meet institutional or institutional-level-of-care requirements.
Quick answer: A Medicare Special Needs Plan, or SNP, is a type of Medicare Advantage plan that limits enrollment to people who meet specific eligibility criteria. Medicare recognizes three SNP categories: D-SNP for dual-eligible beneficiaries, C-SNP for qualifying severe or disabling chronic conditions, and I-SNP for people who live in certain institutions or meet an institutional level-of-care standard. All SNPs include Medicare Part D prescription drug coverage.
The big picture
What Is a Medicare Special Needs Plan?
A Special Needs Plan is a Medicare Advantage plan built for a defined population with particular healthcare or coverage needs. Like other Medicare Advantage plans, an SNP administers Medicare Part A and Part B benefits through a private plan that contracts with Medicare.
What makes an SNP different is its restricted eligibility and targeted model of care. The plan may tailor its provider network, care coordination, benefits and drug formulary around the group it serves.
To join an SNP, you generally must have Medicare Part A and Part B, live in the plan’s service area and meet the eligibility rules for the specific SNP. You can remain enrolled only while you continue to meet the plan’s special-needs criteria.
SNP describes who the plan is designed for—not a single benefit package. Two SNPs serving the same eligibility group can still have different doctors, hospitals, prescriptions, premiums, copays, prior-authorization rules and extra benefits.
Three Medicare SNP categories
D-SNP vs. C-SNP vs. I-SNP
| SNP Type | Who It Serves | Main Coverage Focus |
|---|---|---|
| D-SNP Dual Eligible Special Needs Plan | People who have Medicare and an accepted level of Medicaid eligibility | Coordinating Medicare coverage with Medicaid benefits and assistance |
| C-SNP Chronic Condition Special Needs Plan | People with one or more qualifying severe or disabling chronic conditions served by that plan | Care and drug coverage tailored to the qualifying condition or related conditions |
| I-SNP Institutional Special Needs Plan | People living in certain institutions, expected to live there long enough to qualify, or certain people in the community who need an institutional level of care | Coordinating Medicare coverage around institutional or institutional-level care needs |
The letters identify the eligibility group. They do not tell you whether a particular plan has your doctors, covers your prescriptions or has favorable costs.
Three hypothetical examples
- D-SNP: A Missouri resident has Medicare and MO HealthNet. Before comparing extra benefits, the resident confirms that the exact D-SNP accepts their Medicaid category and serves their county, then checks doctors, prescriptions and pharmacy participation.
- C-SNP: A person with diabetes finds a C-SNP advertised locally. The plan must serve the person’s qualifying condition and verify eligibility. The person still checks their clinician, insulin and other medicines, devices and pharmacy; the diagnosis alone does not establish coverage or a good fit.
- I-SNP: A nursing-facility resident expects to need institutional care for at least 90 consecutive days. The plan must confirm the applicable eligibility requirements and that its providers serve the facility. I-SNP enrollment does not by itself make ongoing custodial care or room and board a Medicare-covered benefit.
These examples illustrate questions to ask; they are not individual eligibility determinations or recommendations for a specific plan.
Dual eligibility
What Is a D-SNP?
A Dual Eligible Special Needs Plan is for people who qualify for both Medicare and Medicaid. The exact Medicaid category a plan accepts can vary, so having a Medicaid card does not automatically mean every D-SNP in the county is available to you.
D-SNPs must contract with the applicable state Medicaid agency and are designed to coordinate Medicare and Medicaid. Some D-SNPs are more integrated than others, and the relationship between the Medicare plan and Medicaid managed care can be especially important for full-benefit dual-eligible beneficiaries.
This page does not duplicate the D-SNP series. If D-SNP is the relevant category, continue with What Is a D-SNP? for eligibility, Medicaid coordination and benefits, then use How to Compare D-SNP Medicare Plans for plan-level decisions.
Chronic-condition eligibility
What Is a C-SNP?
A Chronic Condition Special Needs Plan limits enrollment to people with one or more severe or disabling chronic conditions that the plan is approved to serve. A C-SNP may focus on one condition or a group of related conditions.
Examples of conditions that can be served by C-SNPs include diabetes, chronic heart failure, certain cardiovascular disorders, chronic kidney disease or ESRD, dementia, certain chronic lung disorders, HIV/AIDS, cancer, stroke and other CMS-recognized conditions. The existence of a diagnosis does not mean every C-SNP is available to that person. The exact plan must serve the condition, be offered in the service area and confirm eligibility. If diabetes is the condition at issue, the separate Medicare Diabetes Coverage guide explains insulin, CGMs, pumps and Part B-versus-Part D coverage without changing C-SNP eligibility rules.
Condition-specific care
The plan’s care-management approach may be designed around the condition or related conditions it serves.
Prescription design
All SNPs include Part D, and a C-SNP formulary may be designed with the needs of its target population in mind.
Eligibility verification
Do not enroll based only on a plan advertisement. Confirm that the exact diagnosis and eligibility criteria satisfy the plan’s rules.
Institutional care needs
What Is an I-SNP?
An Institutional Special Needs Plan serves beneficiaries who meet institutional eligibility requirements. This can include someone who lives—or is expected to live for at least 90 consecutive days—in certain facilities such as a nursing facility or skilled nursing facility.
Medicare also recognizes institutional-level eligibility for certain people who live in the community but require the level of care that would otherwise be provided in an institution. The plan must determine that the person meets the applicable requirements.
Facility participation matters. If someone lives in a nursing home or other facility, verify that the I-SNP has providers who actually serve that facility and that the facility’s care arrangements work with the plan. Eligibility alone does not guarantee convenient provider access.
Features shared across SNPs
What Do D-SNPs, C-SNPs and I-SNPs Have in Common?
They are Medicare Advantage plans
SNPs provide Medicare Part A and Part B benefits through Medicare Advantage. Network and plan rules can apply.
They include Part D
All Medicare Special Needs Plans must include Medicare prescription drug coverage.
They have limited eligibility
You must meet the eligibility criteria for the plan and live in its service area.
They use targeted care coordination
SNPs are designed around the needs of the population they serve and follow a specialized model of care.
The normal Medicare Advantage questions still matter. Check the plan’s provider network, prescription coverage, authorization and referral rules, medical cost sharing and maximum out-of-pocket exposure.
Networks and access
Can You Use Any Doctor With a Special Needs Plan?
Not necessarily. SNPs are Medicare Advantage plans, so provider-network rules can apply. Some plans may allow certain out-of-network services, while others rely more heavily on in-network care. Referral requirements can also vary.
Before enrolling, verify the exact primary care doctor, specialists, hospital, pharmacy, facility and other providers you expect to use. For a D-SNP, also consider whether providers can properly coordinate with Medicaid. For an I-SNP, confirm that the plan’s providers serve the facility or setting where care is delivered.
Start with the same provider verification process used for other Medicare Advantage coverage: understand the plan’s network structure and verify providers under the exact plan rather than only the insurance-company name.
Use the matching enrollment guide
Where Should You Check SNP Enrollment Rules?
This page compares the three Special Needs Plan categories. It does not determine which election period permits a particular enrollment, plan change or disenrollment.
For D-SNP timing: Use the dedicated D-SNP Enrollment Periods and Dual/LIS SEP guide. For other Medicare enrollment events, use the broader Medicare Special Enrollment Periods guide. Verify the exact election period before submitting a coverage change.
If the qualifying status changes
What Happens If You Stop Qualifying for the SNP?
You can remain in an SNP only while you continue to meet the plan’s eligibility requirements. If the qualifying Medicaid status, chronic-condition eligibility or institutional status changes, the plan may have to disenroll you after the applicable rules and grace periods are followed.
Do not wait until coverage ends to investigate the next step. Review the plan notice, confirm the date your eligibility changes and identify the election period available to move to another Medicare Advantage plan, Original Medicare and Part D, or other appropriate coverage.
If the issue is specifically a loss of Medicaid while enrolled in a D-SNP, use What Happens If You Lose Medicaid While in a D-SNP?
Choosing among eligible plans
How Should You Compare Special Needs Plans?
First determine which SNP category you actually qualify for. Then compare the plans available to that category using the same practical questions that matter in any Medicare Advantage decision.
- Confirm eligibility. Make sure the exact plan accepts your Medicaid category, qualifying condition or institutional status.
- Verify providers and facilities. Check every important doctor, hospital, facility and service location.
- Run every prescription. Compare formulary status, tiers, utilization rules and pharmacies.
- Understand care coordination. Ask how the plan’s model of care applies to your needs and, for D-SNPs, how Medicare and Medicaid are coordinated.
- Compare medical costs. Review premiums, copays, coinsurance and maximum out-of-pocket limits.
- Evaluate supplemental benefits last. Dental, vision, hearing, transportation, OTC or other benefits can matter, but they should not outweigh basic access to needed medical care.
For the complete Medicare Advantage decision framework, see How to Choose a Medicare Advantage Plan.
Frequently asked questions
Medicare Special Needs Plan Questions
What does SNP stand for in Medicare?
SNP stands for Special Needs Plan. It is a Medicare Advantage plan limited to people who meet the eligibility rules for a defined special-needs population.
What are the three types of Medicare Special Needs Plans?
The three categories are Dual Eligible Special Needs Plans (D-SNPs), Chronic Condition Special Needs Plans (C-SNPs) and Institutional Special Needs Plans (I-SNPs).
Do all SNPs include prescription drug coverage?
Yes. Medicare requires Special Needs Plans to include Medicare Part D prescription drug coverage.
Is a D-SNP the same thing as every Special Needs Plan?
No. D-SNP is only one of the three SNP categories. It is specifically for people who qualify for Medicare and an accepted level of Medicaid. C-SNPs and I-SNPs use different eligibility criteria.
Can a C-SNP cover more than one chronic condition?
Yes. A C-SNP may limit enrollment to one qualifying chronic condition or to a group of related qualifying conditions. Check the eligibility rules for the exact plan.
Do you have to live in a nursing home to qualify for an I-SNP?
Not always. I-SNP eligibility can include people living in certain institutions and certain people living in the community who meet an institutional level-of-care standard.
Can an SNP have a provider network?
Yes. SNPs are Medicare Advantage plans, and network, referral and prior-authorization rules can vary by plan. Verify your providers and facilities before enrolling.
What happens if I no longer qualify for my SNP?
You generally cannot remain enrolled indefinitely after you stop meeting the plan’s special-needs criteria. Medicare provides rules and enrollment opportunities for moving to other coverage; review the plan notice and verify the exact timing.
Compare the exact coverage
Need Help Comparing a Special Needs Plan?
Thompson Medicare Brokerage can help you determine which Medicare Advantage options we represent fit your eligibility and then compare the details that matter: doctors, hospitals, prescriptions, care coordination, costs and plan rules.
Thompson Medicare Brokerage is a non-government insurance agency and is not affiliated with or endorsed by the U.S. government or the federal Medicare program. Special Needs Plan eligibility, availability, networks, formularies, benefits, costs and enrollment rights vary by plan, service area, individual circumstances and coverage year. This page provides general educational information and does not determine Medicare, Medicaid, chronic-condition or institutional eligibility. Verify current eligibility and plan details before enrolling.