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 Hospital Insurance, and Medicare Part B, includes medical insurance. The Medical Insurance (Medicare Part B) covers eligible, recurring or occasional, home health services like skilled nursing, physical therapy, speech-language therapy, pathology services, occupational services and more.