Lewis was evaluated by team physician Dr. Keith Meister before Monday's game against the Boston Red Sox. Meister will perform the operation later this week.
Before the game, Texas manager Ron Washington called Lewis the team's "anchor."
In 16 starts, Lewis is 6-6 with a 3.43 ERA.
ORIOLES' PINIERO TO HAVE SURGERY: Veteran right-hander Joel Pineiro, who pitched in Baltimore's organization this season, will have surgery on his right shoulder Tuesday.
Pineiro has a torn labrum and will also be examined for a possible torn rotator cuff.
The 33-year-old is 104-93 with a 4.41 ERA over 12 major league seasons.
TIGERS ACQUIRE 2 FROM MARLINS: The Detroit Tigers have acquired second baseman Omar Infante and right-hander Anibal Sanchez from Miami, sending 21-year-old righty Jacob Turner and two minor leaguers to the Marlins.
Miami also receives catcher Rob Brantley and left-hander Brian Flynn in the deal.
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