Raisman's allegations follow allegations from teammate McKayla Maroney, a two-time Olympic medalist who accused Nassar of sexually abusing her throughout her career. She also said that she spoke to FBI investigators about him after last year's Olympics in Rio de Janeiro, where she helped the United States retain their team gold.
RAISMAN: Why are we looking at why didn't the girls speak up?
She would not divulge exactly what Nassar did to her, but she did say that he began treating her at the age of 15.
Larry Nassar is accused of multiple sexual abuse on gymnasts for almost 20 years. In July, he pleaded guilty to three child pornography charges in federal court, ABC News reported via ESPN. More than 130 women have filed civil lawsuits against the doctor claiming abuse.
The USA Gymnastic association told 60 Minutes in a statement that they were "very sorry" to hear of Raisman's alleged abuse and that they would be working with her - and other victims - to keep their athletes safe moving forward. I can't. Every time I look at them, every time I see them smiling, I just think ...
The former athlete, who claims to be "angry", wants to "just bring change" so that young gymnasts "never have to live this again".
This includes 22 counts of first-degree criminal sexual conduct, which could lead to a life sentence in prison, according to reports. He was sacked by USA Gymnastics in 2015 after working with the organization since 1986 - he had been its national medical coordinator since 1996, the New York Times reported.
Raisman has also called for sweeping changes in leadership, including the removal of the chairman of the board, Paul Parilla.
Nassar's case was part of a wide-ranging scandal which forced the resignation of USA Gymnastics chief Steve Penny previous year. She says she met with the Federal Bureau of Investigation after the 2016 Olympics in Rio.
USA Gymnastics launched an independent review of its policies in the wake of the allegations against Nassar in the summer of 2016, following reporting by the Indianapolis Star that highlighted chronic mishandling of abuse allegations against coaches and staff at some of its more than 3,500 clubs across the country. The new guidelines require member gyms to go to authorities immediately, with Daniels suggesting USA Gymnastics consider withholding membership from clubs that decline to do so.