Justice Ginsburg went home after the fall, but after experiencing discomfort overnight, she went to George Washington University Hospital Thursday morning.
Test showed she had three fractured ribs on her left side. She was admitted for observation and treatment, the spokesperson said.
Ginsburg broke two ribs in a fall in 2012. She has had two prior bouts with cancer and had a stent implanted to open a blocked artery in 2014.
Ginsburg, 85, has served on the Supreme Court since 1993 after being appointed by then-President Bill Clinton.
The Associated Press contributed to this report