The NYPD rescued an unhinged man from the East River yesterday.

Detective Robert Mirfield drove to the scene near 81st Street at 9:50 a.m. after hearing that a man had been spotted in the water, while his partner, Officer Paul Braver, changed into a dry suit.

Braver jumped in and reached the man, and Harbor Patrol cops pulled them onto their boat, police said.

Cops took the 32-year-old man to New York Cornell Hospital, and he was identified after he gave them his mother’s phone number, sources said.

rharshbarger@nypost.com