Sorrentino had been receiving treatment at the Cirque Lodge in Utah for a "prescription medication problem" as well as an alleged alcohol dependency.
The reality star reportedly completed his rehab recently and was spotted at an airport near the Cirque Lodge this week, reports TMZ.
Sorrentino's spokesperson has not commented on this report.
He previously admitted that he turned to prescription drugs to combat "exhaustion", but realised the habit had gotten out of control.
Sorrentino also stressed that he will need time to recover from his busy "work and appearance schedule".
The star is believed to be reuniting with Nicole 'Snooki' Polizzi, Pauly D and Jennifer 'JWoww' Farley for the upcoming sixth season of Jersey Shore.
> Jersey Shore Angelina: 'The Situation like Popeye on crack'
> Jersey Shore's JWoww: 'The Situation sometimes isn't a good guy'