A coroner said the star, found dead at his home in Oxfordshire on Christmas Day, had a heart condition known as dilated cardiomyopathy with myocarditis.
The 53-year-old also suffered from a fatty liver, according to Oxfordshire's senior coroner Darren Salter.
"Inquiries into the death of George Michael have been concluded and the final post mortem report received," the coroner said, in a statement reported by Britain's Press Association.
"As there is a confirmed natural cause of death, being dilated cardiomyopathy with myocarditis and fatty liver, the investigation is being discontinued and there is no need for an inquest or any further inquiries."
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