Police spokesman Rosario Herrera says Khristine Eroshevich turned herself in on Monday.

She did not immediately post the US$20,000 (S$31,000) bail.

Eroshevich is charged with conspiring with another doctor and Smith's lawyer-turned-boyfriend Howard K Stern.

Attorney-General Jerry Brown alleges the doctors falsified prescriptions and prescribed unwarranted amounts of highly addictive medications to Smith.

Eroshevich's attorney says she was only protecting Smith's privacy. -- AP