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 is hospital insurance. Just about everyone age 65 and over is eligible for Medicare Part A, though some have to pay a monthly premium. But being eligible doesn't mean that Part A covers all hospital costs, and even after Part A does pay, participants are typically left with hefty out-of-pocket costs.