Medicare Part B covers physician services, outpatient hospital services, certain home health services, durable medical equipment, and certain other medical and health services not covered by Medicare Part A. The increase in the standard monthly premium—from $148.50 in 2021 to $170.10 in 2022—is based in part on the statutory requirement to prepare for expenses, such as spending trends driven by COVID-19, and prior Congressional action in the Continuing Appropriations Act, 2021 that limited the 2021 Medicare Part B monthly premium increase during the COVID-19 pandemic. It also reflects the need to maintain a contingency reserve for unanticipated increases in health care spending, particularly certain drug costs. There is significant uncertainty regarding the potential for future coverage of clinician-administered Alzheimer’s drugs (i.e., Aduhelm™), requiring additional contingency reserves. Potential Medicare drug coverage is currently the subject of a Medicare National Coverage Determination (NCD) analysis, which, if covered, could increase Medicare spending. The proposed NCD on Aduhelm (as well as any drugs in this category) is still to be determined.