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🛡️ '''Medicare supplement insurance''' — widely known in the industry as Medigap — is a type of [[Definition:Health insurance | health insurance]] policy sold by private [[Definition:Insurance carrier | insurance carriers]] to fill the coverage gaps left by Original Medicare (Parts A and B). These gaps include [[Definition:Deductible | deductibles]], [[Definition:Copayment | copayments]], [[Definition:Coinsurance | coinsurance]], and certain services not covered by the federal program, which can expose seniors to significant out-of-pocket costs. Medigap policies are standardized by the Centers for Medicare & Medicaid Services (CMS) into lettered plan types (A through N), so the benefits within each letter designation are identical regardless of which carrier issues the policy — a regulatory feature that makes price and service quality the primary competitive differentiators.

⚙️ Carriers offering Medicare supplement insurance must adhere to strict federal and state regulations governing [[Definition:Guaranteed issue | guaranteed issue]] periods, rate-setting methodologies, and prohibited [[Definition:Pre-existing condition | pre-existing condition]] exclusions during open enrollment. Pricing approaches vary: community-rated plans charge every policyholder the same [[Definition:Premium | premium]] regardless of age, attained-age plans increase premiums as the insured ages, and issue-age plans lock rates to the age at purchase. [[Definition:Actuarial analysis | Actuaries]] must model demographic aging, medical cost trends, and [[Definition:Lapse rate | lapse rates]] carefully because the insured population skews older and utilization patterns differ markedly from commercial group health books. [[Definition:Loss ratio | Loss ratios]] are subject to minimum thresholds set by regulation, reinforcing that these products must deliver genuine value to enrollees.

📊 The Medigap market represents a substantial and growing segment of the U.S. insurance landscape as the baby-boomer generation continues to age into Medicare eligibility. For carriers, the block is attractive because of its predictable premium flow and relatively stable regulatory framework, but it demands disciplined [[Definition:Underwriting | underwriting]] and long-term [[Definition:Reserve | reserving]] discipline given the lifetime nature of many policies. [[Definition:Insurance agent | Agents]] specializing in the senior market find Medigap a cornerstone product for building client relationships, often cross-selling [[Definition:Long-term care insurance | long-term care insurance]] and [[Definition:Medicare Advantage | Medicare Advantage]] plans alongside it. As healthcare costs continue to escalate, Medicare supplement insurance remains essential to retirees seeking financial predictability — and to insurers seeking a durable, regulation-defined revenue stream.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Medicare Advantage]]
* [[Definition:Health insurance]]
* [[Definition:Coinsurance]]
* [[Definition:Guaranteed issue]]
* [[Definition:Long-term care insurance]]
* [[Definition:Loss ratio]]
{{Div col end}}

Definition:Medicare supplement insurance - Revision history

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