Zhi Alan Cheng, 33, was in a New York courtroom on Monday where he was charged with 50 new counts- including rape, sexual abuse, assault, misdemeanor drug possession and unlawful surveillance.
The charges are based on Cheng's encounters with six women - including patients.
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But prosecutors say there are videos of assaults involving at least six other unidentified women in hotels or homes in New York, Las Vegas, San Francisco, and Thailand.
In the Bay Area, Cheng completed his residency at California Pacific Medical Center in San Francisco which was affiliated with the Santa Clara Valley Medical Center.
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