Each count carries a maximum penalty of up to one year in jail and a $5,000 fine upon conviction.
It wasn't known whether Fetty has an attorney. And Losh said it's unclear how many patients were photographed.
"Some of the pictures were unidentifiable because there wasn't a face,'' he said.
According to the criminal complaint, hospital officials confirmed the people in the photos were patients and were "clinically incompetent and could not provide consent to the images.''
A statement from the state Department of Health and Human Resources said the agency is cooperating with the police investigation.
"The protection of our patients is of the utmost importance,'' the statement said.