A spokeswoman for Carter said there were no complications from the procedure, but wouldn't give a timetable on his release.
He “will remain in the hospital as long as advisable for observation,” said Deanna Congileo on Tuesday.
Lowden drove to Atlanta on Wednesday with dozens of well wishes from the president's boyhood home of Plains and his home church, Maranatha.
“Everyone is praying and concerned about him and making sure that he is OK,” Lowden said.
Young visited their church on Sunday to teach Sunday School with Carter.
Lowden said he expects to field at least one question from Carter: When can he return to teaching Sunday School?
Carter has been teaching Sunday School regularly at Maranatha for 40 years.
After he broke his hip in May and fractured his pelvis in October, Carter missed both of his immediately scheduled classes, but quickly made them up the following Sundays.
“I am going to tell him that we have everything in order at the church, and he doesn’t have to worry about anything,” Lowden said. “There is no need to rush.”