More than 100 fresh charges have been laid against a former Melbourne doctor accused of recording colleagues in bathroom cubicles at multiple Melbourne hospitals.

Ryan Cho, 27, was charged with six offences last month relating to alleged offending at the Austin Hospital in Heidelberg, where he was accused of using a mobile phone to record coworkers inside staff toilets.

Detectives yesterday laid 127 further charges against Cho, related to stalking, producing intimate images and installing optical surveillance devices.

They relate to alleged offending at the Austin, as well as the Royal Melbourne Hospital and the Peter MacCallum Cancer Centre.

Additional medical facilities where Cho worked between 2020 and 2025 are still being investigated by police.

Forensics found more than 4500 intimate videos allegedly secretly recorded in showers and hospital toilets between 2021 and 2025.

Police allege they were found inside folders named after three hospitals, their bathrooms and hundreds of alleged victims.

According to police, the majority are female doctors, nurses and paramedics who used staff facilities at the Austin Hospital, the Royal Melbourne and Peter MacCallum Cancer Centre.

Cho, who remains in police custody, will appear at the Supreme Court tomorrow.

The Singaporean national arrived in Australia in 2017 to study at Monash University.