Joan Rivers' sudden death is sparking rumors of a possible medical malpractice by doctors at the Yorkville Endoscopy Center.

On August 28, the "Fashion Police" host went to the clinic to undergo a routine endoscopy check up. However, it was recently revealed that a doctor suggested that she undergoes an unplanned biopsy on her vocal chords after they saw "something," according to the NY Daily News.

Medical experts are now saying that such a delicate procedure shouldn't be performed outside hospitals.  

As a result, Rivers' vocal chords seized and she suffered a condition called laryngospasm that cut off her air supply.

"A biopsy like that should only be done in a hospital setting. If she had been in a hospital when it happened, she might have been okay," the source said.

The insider also revealed that Rivers only signed to undergo an endoscopy procedure, and not any other procedure to touch her vocal chords.

Meanwhile, a spokesperson for the Yorkville Endoscopy Clinic described their institution as a "federally and state licensed facility" that has "the same level of life-saving and resuscitation devices (such as state-of-the-art cardiac defibrillators, airway management equipment, etc) found in any hospital emergency room or hospital-based operating room."

Rivers' only daughter, Melissa, is currently contemplating on filing a medical malpractice case against the doctor who performed the producer on her mother, as well as the medical institution itself, Times of India reported.

In another news, Rivers also revealed the list of people she wants banned from her funeral months before she passed away, Haaretz noted.

The list shockingly included First Lady Michelle Obama, Adele and Chelsea Handler. Reports claimed that the 81-year-old comedian previously called Obama a "tranny" and dubbed award-winning singer Adele as "fat."

"Melissa says, 'I don't want to hear about it, I don't want to talk about it.' But I say it's coming. It's inevitable. It's no longer an abstract thing. It's like, God, I'm in my eighties. Nobody, when I die, is going to say, 'How young?' They're going to say, 'She had a great ride,'" Rivers was quoted saying.