Michael Tyshkov, 62, of Livingston, was charged with sexual assault and criminal assault, Acting Prosecutor Micahel A. Monahan said in a statement.
The victim was assaulted on multiple occasions during medical exams that occurred between April 2016 and last month, authorities said.
Tyshkov was being held at the Union County Jail.
Anyone with information that could help the investigation is asked to call Detective Jennifer Smith of the Special Victim's Unit at 908-965-3814 or Detective Christopher Medina of the Summit Police Department at 908-273-0051
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