The surgery will be performed in San Diego by team doctor Heinz Hoenecke.
Wieland said Kremchek was encouraged to find "nothing structurally" wrong with the elbow. Wieland is less than two years removed from reconstructive elbow surgery.
Wieland reported soreness in the elbow a week ago, though in the triceps area and not the ligament. He had an MRI that showed no damage to the ligament. The initial diagnosis was Wieland would not throw for seven to 10 days before being looked at again.
"I fully expect to be back before the All-Star break," Wieland said.
It was pain in the triceps area that caused Wieland to slow his rehabilitation program a year ago and which ultimately led to a stress reaction. But, again, there has never been an issue with the ligament.
Wieland appeared in four games this spring, allowing nine earned runs over seven innings -- including five earned runs over 2 1/3 innings last Saturday against the Dodgers. It was after that outing that he reported soreness in the elbow.
But up to that point, the Padres and Wieland were encouraged with the way he was throwing, including the notable uptick in velocity that often saw him hit the mid-90s.
While Wieland is disappointed to miss the early part of the season -- he was likely headed to Triple-A El Paso before this incident -- he's confident Kremchek has found the cause of what's troubled him for the past year or so.
"It's good that they finally have found what's causing the pain," he said.
Corey Brock is a reporter for MLB.com. Keep track of @FollowThePadres on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.