American former CNN talk show host Larry King has been hospitalized with COVID-19, reported US media on Saturday.

87-year-old King is undergoing treatment at Cedars-Sinai Medical Center in Los Angeles and has been under treatment for more than a week according to CNN. King's family are being kept from visiting him by the hospital's protocols.

The Peabody Award-winning broadcaster was among America's most prominent interviewers of celebrities, presidents and other newsmakers during a half-century career that included 25 years with a nightly show on CNN.

He has had medical issues in recent decades, including diabetes, heart attacks and lung cancer.

Last year, King lost two of his five children within weeks of each other. Son Andy King died of a heart attack at 65 in August, and daughter Chaia King died from lung cancer at 51 in July.

(With input from AP.)