The shooting happened at about 10:30 a.m. Saturday on the southbound platform of the 4, 5 and 6 trains.
Police said a 40-year-old man was walking on the platform when a gunman approached him and shot in the left arm. He was in stable condition at a nearby hospital, police said.
Crumpty is charged with attempted murder, assault, and criminal possession of a loaded firearm. It was unclear if Crumpty and the victim knew each other.
No information about a lawyer for Crumpty was available.
The shooting is yet another of a surge of gun violence that has plagued New York City this year.
The shooting disrupted subway service along the 4 and 6 lines in Manhattan.