Authorities say Keber Martinez spotted his 35-year-old victim inside the waiting area outside the hospital's emergency room Tuesday afternoon.
The two, who are believed to know each other, then got into a verbal dispute.
Martinez fired four shots, striking the other man once in the arm and sending everyone in the waiting area scrambling for safety.
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Mayor Eric Adams said the shooting was possibly gang related and that the suspect "noticed a rival gang member, possibly."
"He pulled out a gun and shot the person," Adams said. "And sitting in the emergency room at the time were families, a child, and hospital staff."
The victim was rushed into the emergency room, while the gunman fled the scene.
In surveillance video obtained by Eyewitness News, the gunman is seen opening fire.
VIDEO: Gunman fires shots inside Jacobi Hospital waiting room
Both men were in the hospital for treatment of prior injuries at the time.
The victim had been shot in the leg last year, and he was reportedly experiencing pain from that injury when he went to the hospital.
Martinez was charged with attempted murder, reckless endangerment and criminal possession of a firearm.
He has six prior arrests, the last in May 2020, for assault, drugs, grand larceny and criminal possession of a weapon.
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