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🏥 '''Medigap insurance''' is the informal but widely recognized name for [[Definition:Medicare Supplement insurance | Medicare Supplement insurance]] — standardized private [[Definition:Health insurance | health insurance]] policies sold in the United States that fill the coverage gaps left by Original Medicare (Parts A and B). These gaps include [[Definition:Deductible | deductibles]], [[Definition:Coinsurance | coinsurance]], and [[Definition:Copayment | copayments]] that beneficiaries would otherwise pay out of pocket. The term "Medigap" is so commonly used by consumers, agents, and regulators alike that it functions almost interchangeably with the formal designation, though "Medicare Supplement" remains the official regulatory label.

⚙️ Medigap policies are sold by private insurers but must conform to one of several standardized plan designs established by federal regulation, identified by letters (Plan A, Plan B, Plan G, Plan N, and so forth). This standardization means that a Plan G policy from one carrier offers exactly the same benefits as a Plan G from another — a deliberate regulatory design that forces competition on [[Definition:Premium | premium]] pricing, customer service, and brand trust rather than on benefit complexity. Beneficiaries purchase Medigap coverage individually (employer-sponsored group Medigap exists but is less common), and the policies coordinate directly with Medicare's [[Definition:Claims adjudication | claims processing]] system: after Medicare pays its share of an approved claim, the Medigap insurer automatically receives a crossover claim and pays the remaining covered portion, often with minimal [[Definition:Policyholder | policyholder]] involvement. This seamless coordination reduces administrative friction for both the beneficiary and the carrier.

📈 Medigap represents a significant book of business for major U.S. health insurers, with competitive dynamics shaped by demographic trends, regulatory changes, and the ongoing tug-of-war with [[Definition:Medicare Advantage | Medicare Advantage]] plans for the senior market. Carriers that build large, stable Medigap blocks benefit from predictable [[Definition:Claims experience | claims patterns]] and long policyholder tenure, but face the challenge of managing attained-age rate increases without triggering excessive [[Definition:Lapse rate | lapse rates]] among healthier members — the classic [[Definition:Adverse selection | adverse selection]] spiral. State [[Definition:Department of insurance | insurance regulators]] impose [[Definition:Medical loss ratio (MLR) | loss ratio]] floors to prevent excessive pricing, and several states have enacted additional consumer protections such as continuous open enrollment or birthday-rule provisions that give policyholders annual guaranteed-issue switching rights. For producers, Medigap remains one of the most lucrative segments of the senior insurance market, sustaining a large network of independent agents and [[Definition:Insurance distribution | distribution]] organizations.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Medicare Supplement insurance]]
* [[Definition:Medicare Advantage]]
* [[Definition:Adverse selection]]
* [[Definition:Health insurance]]
* [[Definition:Guaranteed issue]]
* [[Definition:Medical loss ratio (MLR)]]
{{Div col end}}

Definition:Medigap insurance - Revision history

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