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.
What is Part B? Medicare Part A and Part B, together, are called Original Medicare. Through the Center for Medicare &Medicaid Services, the United States government set up Original Medicare to cover a wide range of medical expenses for individuals 65 and older and individuals with certain disabilities. Part A is hospital insurance.