(CNN)The federal government announced a large hike in Medicare premiums Friday night, blaming the pandemic but also what it called uncertainty over how much it may have to be forced to pay for a pricey and controversial new Alzheimer's drug. The 14.5% increase in Part B premiums will take monthly payments for those in the lowest income bracket from $148.50 a month this year to $170.10 in 2022. Medicare Part B covers physician services, outpatient hospital services, certain home health services, medical equipment, and certain other medical and health services not covered by Medicare Part A, including medications given in...