The right-hander received three opinions before announcing on Tuesday that he would need surgery. Gearrin sustained the injury while pitching against the Tigers in a Spring Training game on March 25 in Lakeland, Fla.
Gearrin, who turns 28 on Monday, will join starters Kris Medlen and Brandon Beachy as the third Braves pitcher to undergo Tommy John surgery this year.
Mark Bowman is a reporter for MLB.com. Joe Morgan is an associate reporter for MLB.com.