Gaudin, 30, was arrested Jan. 27 and charged earlier this month with open and gross lewdness, according to The Las Vegas Review-Journal. The arrest wasn't publicized back in January and the newspaper reported on the case on Wednesday.
According to police reports, Gaudin appeared drunk when he approached a 23-year-old woman on a gurney in the emergency room lobby at Desert Springs Hospital, told her she was gorgeous and touched her face and breast.
A paramedic who witnessed the incident told Gaudin to leave the woman alone, but he refused, and security staff held him down until police arrived, the report said.
"I asked Gaudin several times how he ended up at the hospital and each time he told me that he didn't know," the officer wrote in the report. "Gaudin appeared to be intoxicated. He had slurred speech, bloodshot eyes, trouble standing still, obeying commands, an odor of alcoholic beverages and couldn't repeat his house number, where he lives, the same way twice in a row."
Gaudin's lawyer, Dominic Gentile, issued a statement saying his client was ill at the time of the alleged incident and denies any wrongdoing and has been cooperating with authorities.
"Chad Gaudin was examined in the emergency room of a local hospital while experiencing symptoms believed to be related to acute renal failure due to a condition known as rhabdomyolysis. The symptoms included confusion, dehydration and loss of orientation and/or consciousness," Gentile wrote. "Although he has been accused of improperly touching another hospital patient while on the premises that night, there are differing and exonerating versions of what occurred that have been reported by eye witnesses."
Common causes for rhabdomyolysis include alcohol or drug use, muscle strain, or crush injuries, according to the National Institutes of Health.
Gaudin, who has pitched as a starter and in relief, is 2-1 this year with a 2.44 ERA. He last pitched against the Los Angeles Dodgers on Sunday, when he got a no decision, going seven innings and giving up a run on four hits.
He's married and has one son, according to his biography on the Giants' official website.
Information from The Associated Press contributed to this report.