A Manhattan mom dropped a dime on the private school where a student heated up a quarter and put it on her son’s neck, according to a lawsuit.

The boy’s mother says the November 2015 incident in a biology lab at La Salle Academy on East Sixth Street injured her son and cost her money for a hospital visit and X-rays.

She seeks unspecified damages in a Manhattan Supreme Court claim that accuses the school of failing to supervise the kids.

The school declined to comment.