Blunt's office said he had a "routine and successful" outpatient procedure at Washington's George Washington University hospital Thursday, two days after his 62nd birthday, the St. Louis Post-Dispatch reported.
Doctors had found a coronary blockage during a physical examination earlier this week, The Kansas City (Mo.) Star said.
"I continue to be a strong believer in the life-saving importance of early detection, and I encourage everyone to be proactive about their preventive screenings," Blunt said. "I'm very grateful for the care that I received from the medical professionals at George Washington University Hospital, and I look forward to returning to my regular schedule very soon."