The Bobcats' first-year head coach checked himself into a Charlotte hospital with chest pains Thursday night. He was hospitalized overnight and doctors performed the procedure the following day.
Associate head coach Patrick Ewing filled in as head coach against the New York Knicks on Friday night, a game the Bobcats lost 101-91 to fall to 3-3.
The 52-year-old Clifford joined the Bobcats during this offseason, replacing Mike Dunlap, who was fired after one season.
Clifford will have a busy week as the Bobcats have four games in six days beginning Monday.