Henry will be called up from Triple-A Reno to start Wednesday's game against the Guardians, Steve Gilbert of MLB.com reports.
The Diamondbacks needed to add a starter to their rotation, and they decided to go with Henry, who posted a 3.83 ERA and 1.34 WHIP over 20 starts with Triple-A this season. Henry tossed a total of 24.2 innings over his last four Triple-A starts, so he shouldn't be on a strict pitch count in his big-league debut.