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(TMZ) - The doctor who performed the endoscopy on Joan Rivers has been fired by the clinic's board, reports TMZ.

Sources at Yorkville Endoscopy tell TMZ Dr. Lawrence Cohen stepped down after the board asked him to do so -- however the board isn't directly blaming him for Joan's death.

According to TMZ, a rep for the clinic confirmed he was ousted from his position as medical director.

According to TMZ's sources ... the board's issue with Cohen is that he allowed Joan's ENT doc to step in and perform an unauthorized procedure. Reportedly, that procedure was a biopsy ... and Joan went into respiratory and cardiac arrest while it was being done.

Cohen is a world renowned gastroenterologist ... and also co-owner of Yorkville. He's been on administrative leave since Joan's procedure on August 28.

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