A new analysis also found wide disparities in age and race, with Black and young people receiving treatments at far lower rates than white and middle-aged people.
The shot is covered by Medicare Part D, but some with private prescription drug coverage are being asked to pay out of pocket.
The F.D.A. gave full approval to the drug, but added a black-box warning about safety risks. Medicare said it would cover most of the high cost.
The Biden administration has proposed changes to how it would pay private Medicare Advantage plans, setting off a lobbying frenzy.
More hospitals and medical practices have begun charging for doctors’ responses to patient queries, depending on the level of medical advice.
The drug, Leqembi, may modestly slow cognitive decline in early stages of the disease but carries some safety risks. Still, data suggests it is more promising than the small number of other available treatments.
Nearly all Americans over 65 got their initial Covid vaccines. But that immunity is waning, and this time, the government is offering far less support for new shots.
Proposed regulations would crack down on misleading ads for the private plans and would enhance scrutiny of denials for coverage of medical care.
A new federal program offers hefty payments to small hospitals at risk of closing. But it comes with a bewildering requirement: to end all inpatient care.
Officials cited data showing the new Alzheimer’s drug has serious safety risks and may not help patients.