The diagnosis came after the 86-year-old actor's wife Kristina Tholstrup took him to an emergency doctor in Monaco after he began losing weight and passing out recently, reported Daily Express.
Recently, Hollywood star Tom Hanks revealed that he has diabetes.
"I have got the dreaded Tom Hanks. Tom Hanks came out with the fact he has diabetes, and about four or five weeks ago I was falling asleep and just feeling terrible and dying of thirst and literally passing out," Moore said.
"My wife took me into emergency at Princess Grace Hospital in Monaco and I was straight on a slab... And I have diabetes. And I've obviously had it for quite a long time... During that week where I was falling asleep, my wife said I was losing a kilo a day. So, I have had to have all my trousers taken in," he added.