When we use a negative construction (with not) in the main clause, until means 'not before'. I won't (will not) start cooking until you come home. until three kilometres.
Medicare Part A is hospital insurance that covers inpatient hospital care and certain home care. Medicare Part A is usually free if you or your spouse paid Medicare taxes while working. If not, it can cost up to $413 each month in 2017. Hospital and skilled nursing facility stays come with deductibles and co-insurance.
Medicare Part A covers institutional care in hospitals and skilled nursing facilities, as well as certain care given by home health agencies and care provided in hospices. Any person who has reached age 65 and who is entitled to Social Security benefits is eligible for Medicare Part A without charge.