Medigap rules in
Massachusetts
Continuous or annual guaranteed-issue beyond federal floor + State does not use the federal 10-letter system
What the rule says
Per Massachusetts regulation 211 CMR 71: "No issuer participating in the market for Medicare Supplement Insurance shall at any time deny or condition the issuance of any Medicare Supplement Insurance Policy for sale in Massachusetts." Massachusetts operates continuous (year-round) open enrollment with community rating — same price regardless of age, health, claims, or genetic information. Massachusetts is ALSO a structural-exception state: per medicare.gov, "In Massachusetts, Medigap policies are standardized in a different way and offer these basic benefits: Inpatient hospital costs; Medical costs; Blood; Part A hospice coinsurance or copayment." Massachusetts plans are sold as Core, Supplement 1, and Supplement 1A — NOT the federal A–N letter system.
Mechanics
Continuous open enrollment + community rating + state-specific plan structure (Core, Supplement 1, Supplement 1A). Federal 6-month OEP is irrelevant because Massachusetts continuous GI is permanently more protective. Federal 10-letter plans (A through N) are NOT sold in Massachusetts.
Massachusetts Medigap rule
Last verified:Source:medicare.gov — Compare Medigap plan benefits (Massachusetts)
Important: Massachusetts does not use the federal A–N letter system
If you read about “Plan G” or “Plan N” on a national Medigap site, those letters apply to the other 47 states (and DC). In Massachusetts, your Medigap policies are sold under a different state-specific structure. Talk to your Massachusetts SHIP counselor (below) to understand the Massachusetts plan layout.
Your federal 6-month Medigap window
Regardless of Massachusetts’s state-specific rules, the federal 6-month Medigap Open Enrollment Period (per 42 U.S.C. § 1395ss) applies to you. It begins the first month you are both 65+ and enrolled in Medicare Part B and runs six full calendar months. Find your specific window dates →
Massachusetts state contacts
SHIP counselor (free)
www.mass.gov/shine-serving-the-health-insurance-needs-of-everyone-on-medicare
Federally-funded benefits counseling. No commission. Not a broker.
State insurance department
medicare.gov — Compare Medigap plan benefits (Massachusetts)
www.mass.gov/orgs/division-of-insurance
For complaints about a Medigap insurer, premium disputes, or coverage issues.
Federal “guaranteed-issue” protections may re-open a Medigap window for specific qualifying events
Even after your federal 6-month Medigap Open Enrollment Period closes, federal law (per 42 U.S.C. § 1395ss and CMS regulations) re-opens a guaranteed-issue Medigap window for several qualifying events. During a guaranteed-issue window, insurers cannot deny you a Medigap policy based on health, charge a higher premium based on health, or require medical underwriting.
Loss of group employer coverage
If your employer or union health plan ends or you involuntarily lose your group coverage (including coverage you had through your spouse), federal law re-opens a guaranteed-issue window for Medigap. The window typically begins no later than 63 days before the date your group coverage ends and runs for 63 days after the coverage ends.
Medicare Advantage trial right (first 12 months)
If you joined a Medicare Advantage plan when you first became eligible for Medicare at age 65, and you decide within the first 12 months of MA enrollment that you'd rather have Original Medicare with a Medigap policy, federal law gives you a guaranteed-issue right to buy any Medigap policy sold by any insurer in your state.
Medicare Advantage plan termination or service-area reduction
If your Medicare Advantage plan leaves the Medicare program, ends coverage in your area, or you move out of the plan's service area, federal law gives you a guaranteed-issue right to certain Medigap policies.
Loss of Medicaid (in certain configurations)
If you had a Medicare Supplement Select policy and you move out of its service area, OR if certain Medicaid-related coverage transitions occur, federal guaranteed-issue rights may apply. Verify your specific situation with your state SHIP counselor — eligibility is fact-specific.
Insurer bankruptcy or fraud-related coverage end
If your Medigap insurance company goes bankrupt and you lose coverage, or if you lose Medigap coverage through no fault of your own (including misrepresentation by the insurer), federal law re-opens a guaranteed-issue window.
If you think a guaranteed-issue protection may apply to you:
Federal qualifying events have specific timing requirements (some windows are 63 days, others are 60). Contact your state SHIP counselor for free, federally-funded benefits counseling — they can confirm whether your specific situation qualifies and help you act within the window.
Related state pages
Other states with the same category as Massachusetts, plus the full 50-state grid.