The Medicare Program is the federal health insurance program for:

People age 65 or older.
People under age 65 with certain disabilities.
I believe these qualifiers would be covered by the statement about certain disabilities.

Medicare Part A (Hospital Insurance)

Part A helps cover inpatient care in hospitals, including critical access hospitals, and skilled nursing facilities (not custodial or long-term care). It also helps cover hospice care and some home health care. Beneficiaries must meet certain conditions to get these benefits. Most people don’t pay a premium for Part A because they or a spouse already paid for it through their payroll taxes while working.

Medicare Part B (Medical Insurance)

Part B helps cover doctors’ services and outpatient care. It also covers some other medical services that Part A doesn’t cover, such as some of the services of physical and occupational therapists, and some home health care. Part B helps pay for these covered services and supplies when they are medically necessary. Most people pay a monthly premium for Part B.

Medicare Part C

Medicare Advantage Plans are offered by a set of CMS-approved private insurance companies. Medicare Advantage Plans may include additional benefits and prescription drug coverage.

Medicare Part D (Prescription Drug Coverage)

Medicare prescription drug coverage is available to everyone who will or currently is enrolled under Medicare Part A and/or Part B. To enroll in a Medicare Part D prescription drug plan, you must join a stand-alone Part D plan or a Medicare Advantage plan that includes prescription drug coverage. Even if you don’t take prescriptions now, you should consider joining a Medicare drug plan or a Medicare Advantage Plan (Must be enrolled under Part A and Part B) with drug coverage to avoid a penalty.

Medicare Supplemental Plan AKA Medigap

Medicare Supplemental Insurance is designed to cover the gaps in Original Medicare. Medicare Supplemental plans are also known as Medigap plans. They are offered by most private insurance. Medicare Supplemental plans offered by the carriers, only vary by the price for the plan. All the carriers cover the Medicare Supplemental plan the same way. You will have access to all physicians who participate with Medicare nationwide. Some policies offer value added services. All Medicare Supplemental Plans must offer a set of basic benefits, but some Medicare Supplemental plans are designed to offer more. Original Medicare pays for a sizable portion of the healthcare services you need, but you are responsible for paying some portion, including copays, deductibles, and coinsurance.

Please be sure to have credible prescription coverage when enrolling under a Medicare supplemental plan to avoid any possibility of a part D late enrollment penalty.