How You Qualify
If you’re 65 years old, or over 65 and you or your spouse paid Medicare taxes for at least 10 years, you’re eligible for Medicare and can get Medicare Part A for free. While most people will not pay a premium for Part A, there is a monthly cost for Part B. Generally, your Part B premium will be automatically deducted from your Social Security, Railroad Retirement or Civil Service Retirement benefit check. If you don't receive any of those benefit checks, Medicare sends a monthly bill.
If you're under 65 and have been receiving disability benefits from Social Security for two years, you'll be automatically enrolled in Medicare Parts A and B.