The drummer, who refused to be part of the current band reunion, is expected to make a full recovery following the procedure in California, but he has cancelled an upcoming art show in Maryland on 26 October (13).
A statement from the rock star reads: "I am truly sorry that I have to postpone the Absence Of Corners gallery reception.
"The feedback I have received from everyone about this project has been astounding, and I was so looking forward to this event. I want to thank the Annapolis Collection Gallery for everything they are doing. I am honored that they are exhibiting my art, and I hope to get there to celebrate this collection with you all very soon."
The surgery news comes just months after former bandmate Ozzy Osbourne took a swipe at the drummer's ability to keep up with the rest of the reunited group.
He told the New York Daily News, "I don't think he could have done the gig, to be honest. He's incredibly overweight. A drummer has to be in shape. He's already had two heart attacks. I don't want to be responsible for his life."