In addition, Republican lawmakers may

In addition, Republican lawmakers may try to undo some cuts in Medicare, the program for older Americans. Many want to restore money to Medicare’s managed-care program and clip the wings of a new agency empowered to recommend cuts in Medicare. Recommendations from the agency, the Independent Payment Advisory Board, could go into effect automatically unless blocked by subsequent legislative action.

Representative Michael C. Burgess, Republican of Texas and a physician, acknowledged that repealing the law became more difficult with each passing week, as various provisions took effect and were woven into “the fabric of American life.”