The plea was entered Tuesday by Larry Nassar of Holt, who was arraigned by video from jail. Olympic gymnasts, including a Louisville woman, is now facing sex abuse charges.
Nassar has been accused of improper medical techniques with young gymnasts without chaperones present.
He said the victim was "just a child, a little child".
Nassar also worked as a team physician at Twistars Gymnastics Club USA and Holt High School.
Michigan Attorney General Bill Schuette plans to talk to reporters about the Nassar investigation Tuesday.
MASON, Mich. (AP) - A former USA Gymnastics team doctor pleaded not guilty Tuesday to three counts of first-degree criminal sexual conduct in his MI home with a girl under 13.
University police chief James Dunlap said his department has received roughly 50 complaints.
A Los Angeles woman has filed a civil lawsuit against a former USA Gymnastics doctor charged in MI with sex abuse involving a girl under 13.
The investigation into the additional sexual assaults allegations made against Nassar is ongoing.
Earlier Tuesday, 55th District Court Magistrate Mark Blumer set Nassar's bond at $1 million, saying the allegations involved "clear predatory behavior".
"There are hundred of people who support him 100 percent", Smith said.
Michigan State's website described Nassar as an Associate Professor in the Department of Radiology, Division of Sports Medicine and teaches sports medicine and physical exam skills to the first and second year medical students in the College of Osteopathic Medicine at M.S.U. Authorities said the victim was not a gymnast or a patient but did not detail her relationship to the doctor.
Dunlap and Schuette both confirmed during the press conference that their offices are working together on continued investigations into Nassar.
The September lawsuit alleges that USA Gymnastics was aware Nassar had been accused of engaging in inappropriate touching with some of the team's members but did nothing to address the allegations. Nassar declined to comment, Newburg told CNN. Drew and Mr. Manly represent more than 15 girls and women who allege that Dr. Nassar molested them at MSU. He was on the faculty at Michigan State University but was sacked in September for not complying with "employment requirements" put in place after a 2014 investigation of alleged misconduct.
Denhollander said her mother was at the therapy sessions, but that Nassar positioned himself in such a way that she couldn't see what was happening.
The attorney general has said his department is in the best position to prosecute the case instead of the local prosecutor because it is believed to have crossed into multiple jurisdictions in MI and "possibly across states lines".