This content is for general informational purposes and does not constitute medical, legal, or financial advice. Healthcare rules and costs change annually. Last reviewed: January 15, 2025. Always verify current details with your insurer, employer, or a licensed healthcare navigator.
Medigap (Medicare Supplement Insurance)
Private insurance that covers the gaps in Original Medicare — deductibles, coinsurance, and copays.
Full Definition
Medigap (Medicare Supplement Insurance) is private health insurance sold by private companies to fill the coverage gaps left by Original Medicare (Parts A and B). Medicare typically pays 80% of approved costs, leaving you responsible for the 20% coinsurance, Part A deductibles, and other cost-sharing. Medigap plans cover some or all of these costs. Plans are standardized (labeled A through N) so you can compare them across insurers. You must have Medicare Part A and Part B to buy Medigap.
Real-World Example
You have Original Medicare and a $20,000 surgery. Medicare pays 80% ($16,000); without Medigap, you'd owe $4,000. Your Medigap Plan G covers that entire 20% coinsurance, leaving you with nothing to pay.
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