The medical drama's concluding run would be comprised of just 13 episodes, according to Deadline.
The show's chances are thought to have been helped by a recent ratings bump, with the most recent episode attracting a season high of 8.35m viewers in a new Tuesday night slot.
Though an 18-episode or 22-episode pick-up is still possible, Private Practice star Kate Walsh's new contract is only for 13 instalments.
ABC is expected to make a final decision on the fate of Private Practice - as well as GCB and Body of Proof - once it has screened all of its pilots.
Pilots in development at the network this year include action drama Last Resort, Marc Cherry's Devious Maids and period drama Gilded Lilys from Private Practice creator Shonda Rhimes.
Private Practice star KaDee Strickland recently dismissed rumours that the show is due to be axed.
"Because of the way the show ends this season, it feels to me that a renewal would best serve us," said Strickland, who plays Charlotte King.
The fifth season of Private Practice concludes on May 15 on ABC.
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Watch a promo for tonight's Private Practice below: