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.
Part A covers hospitalization. It helps to pay for hospitalization, limited hospitalization and a skilled nursing facility, and hospice and home health care for those patients who are home bound or bedridden. There are definite limits to what Medicare does and does not cover even if you are hospitalized.