"It was an off-the-cuff remark, a joke, and it is not true. File under April Fool's joke," said Bernard Doherty of LD Communications, which represents the Rolling Stones.
Doherty declined to say any more about why Richards made the statement in an interview with NME, a pop music magazine.
"The strangest thing I've tried to snort? My father. I snorted my father," the 63-year-old guitarist was quoted as saying.
"He was cremated and I couldn't resist grinding him up with a little bit of blow. My dad wouldn't have cared ... It went down pretty well, and I'm still alive."
Photos: Keith Richards
Richards' father, Bert, died in 2002, at 84.
Richards told the magazine that his survival was the result of luck, and advised young musicians against trying to emulate him.
"I did it because that was the way I did it. Now people think it's a way of life," he was quoted as saying.
"I've no pretensions about immortality," he added. "I'm the same as everyone ... just kind of lucky.
"I was No. 1 on the 'who's likely to die' list for 10 years. I mean, I was really disappointed when I fell off the list," Richards said.