The move is retroactive to June 12, when the 26-year-old right-hander went down with a right-elbow strain.
Hochevar has compiled 5-4 record with a 4.96 ERA over 13 starts this season for the Royals.
In corresponding moves, Kansas City recalled pitcher Anthony Lerew from Triple-A Omaha and released pitcher John Parrish, 32, who went 1-1 with a 3.00 ERA in nine appearances with the Royals.
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