Maksim Gelman said nothing and didn't enter a plea as he was arraigned on attempted murder and assault charges.
The hearing Wednesday was conducted through a video link from a hospital where he's being held. It was limited to allegations that the 23-year-old sliced a subway passenger with a knife at Times Square shortly before police wrestled Gelman to the ground Feb. 12.
Gelman's lawyer did not comment.
Gelman was already being held without bail on murder and other charges.
Gelman has told reporters both that the case is a setup and that his mind sometimes "isn't right."