6.2 D-SNP — Dual-Eligible Special Needs Plans
Key Takeaways
- D-SNPs are the largest and fastest-growing SNP category, restricted to beneficiaries entitled to both Medicare and Medicaid (full-benefit or certain partial-benefit dual-eligibles).
- D-SNPs are classified into three integration levels — Coordination-Only (CO), Highly Integrated (HIDE), and Fully Integrated (FIDE) — based on how much Medicaid benefit responsibility the plan itself takes on, and every level requires a State Medicaid Agency Contract (SMAC).
- FIDE SNPs must use exclusively aligned enrollment (the same organization covers both Medicare and Medicaid) and cannot enroll partial-benefit dual-eligibles.
- CMS has been phasing out 'D-SNP look-alike' plans — non-SNP MA plans that disproportionately enroll dual-eligibles without a SMAC — by capping their dual-eligible enrollment concentration.
- Effective January 1, 2025, the old quarterly Dual/LIS SEP was replaced by a monthly Integrated Care SEP that lets full-benefit duals switch into an integrated (HIDE/FIDE) D-SNP once a month — but not into a CO-SNP or standard MA plan.
Why D-SNPs Get Their Own Section
D-SNPs are not a minor niche product — dual-eligible beneficiaries (those with both Medicare and Medicaid) make up the largest single SNP population, and D-SNP enrollment has grown faster than any other Medicare Advantage segment over the past several years. AHIP tests D-SNPs heavily because the rules are genuinely more complex than a standard MA plan: agents must understand not just who qualifies, but which level of Medicare-Medicaid integration a specific D-SNP offers, since that determines what the plan can and cannot coordinate on the enrollee's behalf.
Quick Answer: A D-SNP (Dual-Eligible Special Needs Plan) is restricted to beneficiaries entitled to both Medicare and Medicaid. D-SNPs are further classified as Coordination-Only, Highly Integrated (HIDE), or Fully Integrated (FIDE), depending on how much Medicaid benefit management the plan itself performs, and every D-SNP must operate under a State Medicaid Agency Contract (SMAC).
Who Qualifies: Full-Benefit vs. Partial-Benefit Duals
Dual-eligible status is not all-or-nothing. Full-benefit dual-eligibles receive the complete Medicaid benefit package in their state, in addition to Medicare. Partial-benefit dual-eligibles qualify for Medicare Savings Programs (MSPs) that pay Medicare premiums and/or cost-sharing (QMB, SLMB, QI, QDWI — covered in Chapter 4) but do not receive full Medicaid benefits. Some D-SNPs enroll both groups; others — especially FIDE SNPs — are restricted to full-benefit duals only, because a FIDE SNP is contractually responsible for managing nearly all of the enrollee's Medicaid benefits and cannot do that for someone who doesn't have full Medicaid.
The Three D-SNP Integration Levels
This is the single most exam-relevant D-SNP distinction, and it is easy to confuse the three levels if you don't anchor them to what each one is actually responsible for:
| Integration Level | Medicaid Benefit Responsibility | Aligned Enrollment |
|---|---|---|
| Coordination-Only (CO) D-SNP | Plan provides Medicare services only; Medicaid services come from a separate entity (fee-for-service or a separate Medicaid MCO). Care coordination is required but financial integration is minimal. | Not required |
| Highly Integrated (HIDE) D-SNP | The D-SNP or its affiliated Medicaid managed care organization (MMCO) covers most Medicaid services, but may carve out behavioral health or long-term services and supports (LTSS). | Not required unless the state mandates it |
| Fully Integrated (FIDE) D-SNP | The D-SNP (or affiliated MMCO) covers almost all Medicaid services for the enrollee — the highest integration level available. | Required — exclusively aligned enrollment; cannot enroll partial-benefit duals |
Every D-SNP, at every integration level, must have a State Medicaid Agency Contract (SMAC) with the state — this is the legal agreement establishing minimum care-coordination requirements between the Medicare and Medicaid sides. A CO D-SNP's SMAC will be much thinner than a FIDE SNP's, but no D-SNP can legally operate without one.
Unified Appeals and Grievances
For the more integrated D-SNP types, CMS has directed the establishment of unified Medicare-Medicaid appeals and grievance procedures — meaning an enrollee in a highly integrated D-SNP does not have to navigate two separate appeals systems (one for Medicare-covered services, one for Medicaid-covered services) when a service spans both programs. This is a direct benefit of higher integration and a good example of how the integration level isn't just an administrative label — it changes the enrollee's day-to-day experience.
D-SNP Look-Alikes: A Compliance Trap
A "D-SNP look-alike" is a non-SNP Medicare Advantage plan that disproportionately enrolls dual-eligible beneficiaries without operating as an actual SNP — meaning it skips the SMAC, the Model of Care, and the integration requirements that a real D-SNP must meet, while still marketing itself around dual-eligible-friendly benefits. CMS has moved to close this loophole by capping the concentration of dual-eligible enrollment that a non-SNP plan can carry, phasing look-alikes out of the market. For the exam, remember: if a plan enrolls mostly dual-eligibles but isn't contractually a D-SNP with a SMAC and an approved MOC, it is exactly the kind of arrangement CMS has been actively restricting — agents should not treat "lots of dual-eligible members" as a substitute for actual D-SNP status.
The Integrated Care SEP: A 2025 Rule Change Still Being Tested
D-SNP enrollment periods changed materially starting January 1, 2025, and this is a detail agents recertifying from older training need to update. CMS eliminated the old quarterly Dual/LIS Special Enrollment Period (which had allowed dual-eligible and Low-Income Subsidy beneficiaries to switch plans once per calendar quarter for the first three quarters of the year) and replaced it with a new monthly Integrated Care SEP:
- Who qualifies: full-benefit dual-eligible individuals.
- What it allows: electing an integrated D-SNP (a HIDE, FIDE, or "Applicable Integrated Plan") to align Medicare and Medicaid coverage under one organization, available once per calendar month, effective the first of the following month.
- What it does not allow: during this SEP, the beneficiary can only move into an integrated D-SNP or Original Medicare — not into a Coordination-Only D-SNP or a standard (non-SNP) MA plan.
This restriction is exactly why the CO/HIDE/FIDE distinction from earlier in this section is not just terminology — it determines which plans a dual-eligible beneficiary can actually move into mid-year under this SEP. CMS publishes an annual list of which D-SNPs qualify as "integrated" for this purpose, and that list can change from one plan year to the next.
Exam Scenario
A client has Medicare and full Medicaid in a state where the local D-SNP is a FIDE SNP. The agent should understand that enrolling this client means the D-SNP (or its affiliated Medicaid plan) will manage nearly all of her Medicaid benefits directly, that she must use aligned enrollment (the same organization for both programs), and that if she ever loses full Medicaid and drops to partial-benefit status, she would no longer meet the FIDE SNP's enrollment criteria — a CO D-SNP in the same market might still accept her, since CO D-SNPs typically allow more flexibility on Medicaid benefit source.
Which D-SNP integration level requires exclusively aligned enrollment and cannot enroll partial-benefit dual-eligibles?
What legal agreement must every D-SNP have with the state, regardless of its integration level?