The 54-year-old had pleaded guilty to 10 counts of sexual assault against girls and young women, including Olympians.
Nassar had already been sentenced to 60 years for possession of child pornography.
Judge Rosemarie Aquilina told Nassar during the sentencing: "As much as it was my honour and privilege to hear the sister survivors, it was my honour and privilege to sentence you.
"Because, sir, you do not deserve to walk outside of a prison ever again. You have not owned yet what you did. I wouldn't send my dogs to you, sir. I've just signed your death warrant."