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.
Read about what Medicare Part A (hospital insurance) covers, including inpatient care at a hospital, skilled nursing facility (SNF), and hospice. Part A also covers services like lab tests, surgery, doctor visits, and home health care.