The 25-year-old turtle, called 'Omsin' in Thai, underwent a gruelling seven-hour long surgery on Monday to remove the five kilogramme hoard of coins.
She was sent to veterinarians in Bangkok with a cracked shell and an X-ray unexpectedly revealed the haul, which came in various currencies.
"There were 915 coins in her stomach, we removed them one by one," said Dr Nantrika Chansue, a veterinarian in charge of Chulalongkorn hospital's aquatic research centre to AFP.
"The turtle, 'Piggy Bank' is okay now but she will have to remain at the centre for up to two weeks," the vet added, saying it was the first surgery of its kind.
"A turtle can live up to 80 years and the belief is that throwing coins into the turtle pond will make the coin thrower live longer," Rungroj Thanawongnuvej, Dean of the Faculty of Veterinary Science at Chulalongkorn said in a statement.
"Throwing the coins is more bad karma because it is animal torture," he said.