You are eligible for Medicare if you are a citizen of the United States or have been a legal resident for at least five years and are age sixty-five or older.

Also, you or your spouse must have worked at least ten years or thirty to forty quarters in Medicare-covered employment.

If you or your spouse has worked zero to twenty-nine quarters in Medicare-covered employment, you must enroll as a voluntary enrollee and pay the full Part A monthly premium.

You are also eligible for Medicare if you are younger than age sixty-five with a disability and have received Social Security Disability Insurance or Railroad Retirement disability payments for two years.

You are also eligible if you have amyotriphic lateral sclerosis, also known as Lou Gehrig's disease, and have received your first month of Social Security Disability Insurance payments, or if you have end-stage renal disease.

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