It happened just before 4 a.m. Tuesday at the 96th Street 6 train station.
The victim, a 52-year-old Bronx man, said the suspect walked up to him on the No. 6 subway platform.
A verbal dispute quickly escalated and the suspect struck him with an unknown object, leaving a laceration to the right side of his neck.
The suspect, described as a man in his 30s wearing a green shirt, then fled south on Lexington Avenue.
The victim was hospitalized but was conscious and alert and said to be stable.
No arrests have been made.
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