AceShowbiz -

Health Department is launching a review over a clinic which treated Joan Rivers before her condition went critical last week. According to TMZ, officials at health department confirm that they are "reviewing the matter," but they are not conducting official investigation. The review apparently may take weeks up to months.

Rivers underwent a procedure to repair her vocal cords at Yorkville Endoscopy on Thursday, August 28. The 81-year-old comedian, however, stopped breathing during the procedure and was rushed to Mount Sinai hospital. Sources told the site that health department had contacted the clinic twice since last Thursday.

On Wednesday, the "Fashion Police" star's daughter Melissa Rivers gave an update on her mother's condition, saying that she had been moved from ICU into a private room. "My mother has been moved out of intensive care and into a private room where she is being kept comfortable. Thank you for your continued support," she said.

Numerous celebrities such as Giuliana Rancic, Kelly Osbourne and Mike Tyson have tweeted their support since the comedian got hospitalized. "On behalf of my mother and our family, we are extremely grateful for all the love and support we've received," Melissa said in a previous statement. "I know my mother would be overwhelmed by the continued outpouring of kindness and I want to thank everyone for keeping us in their prayers."