The U.S. government limited Medicare coverage of Biogen Inc.¡¯s Alzheimer¡¯s disease treatment and similar drugs to patients enrolled in clinical trials, a highly unusual move that will curb access to the controversial treatment approved last year.

Coverage of Biogen¡¯s therapy, sold under the brand name Aduhelm, and other amyloid-targeted Alzheimer¡¯s therapies, will be limited to people participating in qualified clinical trials, the Centers for Medicare & Medicaid Services (CMS) said in a statement Tuesday.

The decision is preliminary and will be followed by a 30-day public comment period. A final determination is due in April. The policy will set national rules for how Medicare treats Aduhelm and similar drugs that may follow.