D-SNP Enrollment Deadlines
Missing an enrollment deadline can leave you without desired coverage for months. This guide outlines the key dates dual-eligible individuals should know.
Educational information only. SubsidyCheck does not determine eligibility, enroll you in a plan, or act as a government agency. Final decisions are made by Medicare, your state Medicaid agency, and licensed plan administrators.
Annual Enrollment Period (October 15 – December 7)
AEP is the main window for anyone to join, switch, or leave a Medicare Advantage plan. Changes made during AEP take effect January 1. Mark these dates on your calendar and review your plan's Annual Notice of Change before deciding.
If you do nothing during AEP, you generally stay in your current plan—unless it is leaving the market. In that case, Medicare will notify you and you must choose a new plan.
Quarterly SEP for Dual-Eligible Members
Dual-eligible individuals can change D-SNPs once per calendar quarter: January–March, April–June, or July–September. This is a significant advantage over standard Medicare beneficiaries, who are mostly limited to AEP.
Use the quarterly SEP when your health needs change, your plan's network or benefits shift, or you move within the same state to a different service area.
Initial Enrollment Period Deadlines
If you are new to Medicare, your IEP lasts seven months. Enroll in Parts A and B first, then select a D-SNP if you have qualifying Medicaid. Delaying Part B enrollment can trigger lifelong penalties.
If you gain Medicaid after your IEP ends, a Special Enrollment Period opens. You typically have two months from the Medicaid determination to enroll in a D-SNP.
Other SEP Triggers and Deadlines
Moving to a new service area, losing Medicaid, gaining Medicaid, leaving institutional care, and other qualifying events each trigger SEPs with specific timeframes—usually two to three months from the event.
Document the date of your qualifying event. You may need to provide proof when enrolling outside standard periods.
Consequences of Missing Deadlines
Missing AEP without a qualifying SEP means waiting until the next AEP or quarterly SEP. You could remain in a plan that no longer meets your needs or pay more than necessary.
If you lose Medicaid and miss the SEP to switch plans, you may face disenrollment from your D-SNP. Act quickly when your eligibility status changes.
Frequently asked questions
Can I enroll in a D-SNP on December 8?
AEP ends December 7. After that, you need a qualifying SEP—such as the dual-eligible quarterly SEP if you are eligible.
When does my quarterly SEP change take effect?
Changes made during a quarterly SEP typically take effect the first day of the month after the plan receives your enrollment request.
Is there a deadline to respond to Medicaid renewal?
Yes. Missing your state's Medicaid renewal deadline can cause loss of coverage, which may affect your D-SNP eligibility. Respond to renewal notices immediately.
Sources & official references
Related D-SNP guides
Curious whether a D-SNP may fit your situation?
Take our educational eligibility check. It does not enroll you in a plan or guarantee benefits.