The Parkland star fell and broke his jaw on Sunday while at his home in LA, sources have confirmed.
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Zac, who slipped in a puddle, has had to have his jaw wired shut and also received stitches, an insider revealed to People. Plans to promote his new film, That Awkward Moment, have had to be delayed.
In September, it was revealed that the 26-year-old actor had completed a stint in rehab earlier this year.
Sources said that after ascending to A-list status following the success of the second High School Musical film, he fell in with the wrong crowd.
Zac is said to have beaten his demons, even avoiding alcohol, after a second visit to rehab was prompted by a relapse while shooting the Seth Rogen comedy, Neighbours.
Later in September, Zac broke his silence for the first time since news of his attempt to get help became public knowledge.
Posting an Instagram picture of himself at the Machu Picchu mouton ruins in Peru, he wrote in the caption, "Hey guys! Just returned from an incredible trip to Peru with my dad and wanted to thank you all for your support these past few weeks… means the world to me. Love you guys — Z."