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🇺🇸 '''Medicare''' is the federal health insurance program in the United States that provides coverage to individuals aged 65 and older, certain younger people with disabilities, and those with end-stage renal disease. For the insurance industry, Medicare is not merely a government program — it is a foundational pillar of the U.S. [[Definition:Health insurance | health insurance]] market that shapes how [[Definition:Insurance carrier | carriers]] design products, price [[Definition:Premium | premiums]], and manage risk across both public and private lines. Private insurers interact with Medicare extensively through [[Definition:Medicare Advantage | Medicare Advantage]] plans, [[Definition:Medicare supplement insurance | Medicare supplement (Medigap)]] policies, and [[Definition:Medicare Part D | Part D]] prescription drug programs.

📊 The program is structured in multiple parts. Part A covers inpatient hospital care, skilled nursing, and hospice; Part B covers outpatient services, physician visits, and preventive care. Together, these constitute "Original Medicare." Private insurers participate by offering Medicare Advantage (Part C), which bundles Part A and Part B benefits — and often Part D drug coverage — into managed plans that may include additional benefits like dental and vision. Carriers also sell standalone [[Definition:Medicare Part D | Part D]] plans and Medigap policies that cover [[Definition:Cost-sharing | cost-sharing]] gaps in Original Medicare. The Centers for Medicare & Medicaid Services (CMS) sets the rules, reimbursement rates, and quality benchmarks that private [[Definition:Insurance carrier | insurers]] must follow, making [[Definition:Regulatory compliance | regulatory compliance]] a central operational concern.

💡 Medicare's sheer scale — covering over 65 million Americans — makes it one of the most consequential forces in the insurance landscape. For carriers, the Medicare-related product portfolio represents a major revenue stream, but one that demands sophisticated [[Definition:Actuarial analysis | actuarial modeling]], tight [[Definition:Medical loss ratio (MLR) | medical loss ratio]] management, and constant adaptation to CMS rule changes, star rating adjustments, and reimbursement updates. [[Definition:Insurtech | Insurtech]] companies have increasingly targeted Medicare enrollment, using digital platforms and [[Definition:Data analytics | data analytics]] to streamline plan comparison, simplify the enrollment experience, and improve member retention in a market where annual open enrollment periods create intense competitive pressure.

'''Related concepts:'''
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* [[Definition:Medicare Advantage]]
* [[Definition:Medicare Part D]]
* [[Definition:Medicare supplement insurance]]
* [[Definition:Health insurance]]
* [[Definition:Medical loss ratio (MLR)]]
* [[Definition:Centers for Medicare & Medicaid Services (CMS)]]
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Definition:Medicare - Revision history

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