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.
How often is it covered? Medicare Part A (Hospital Insurance) covers hospital services, including semi-private rooms, meals, general nursing, drugs as part of your inpatient treatment, and other hospital services and supplies.