A man who had an appointment with a doctor at Columbia Doctors at 51 West 51st Street in Manhattan pulled out a switchblade and stabbed a staff member at about 10:30 a.m., police said.
The NYPD says a 25-year-old man got into an argument with a staffer and stabbed the man in the stomach.
Police are not releasing the victim's name. Sources say he works in the mail room. He was treated at New York Presbyterian and is expected to make a full recovery.
The attacker tried to fight off police during his arrest. He was taken to Bellevue Hospital for a psych evaluation.