According to medicare gov/ a Medicare Supplement Insurance (Medigap) policy helps pay some of the health care costs that Original Medicare doesn't cover, like: Copayments Coinsurance Deductibles

According to E health Medicare, Medicare Part B (medical insurance) is part of Original Medicare and covers medical services and supplies that are medically necessary to treat your health condition. This can include outpatient care, preventive services, ambulance services, and durable medical equipment. It also covers part-time or intermittent home health and rehabilitative services, such as physical therapy, if they are ordered by a doctor to treat your condition.

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Advantage of part D plan of Medicare Part D provides prescription drug coverage for Medicare enrollees. Part D plans are offered by private insurers, not the federal government. It is optional coverage that works with many other forms of insurance, including Original Medicare, Medicaid, employer health plans, and, in some cases.

medicare insurance

according to youtube medicaid and medicare services https://www.youtube.com/watch?v=mK8xBe7lrO0

according to google Medicare is a single-payer, national social insurance program administered by the U.S. federal government since 1966.