The legal challenge comes after ICAC's earlier revelation that Berejiklian violated the ministerial code by failing to disclose her relationship with her former partner, Daryl Maguire.
The report also revealed that Berejiklian approved two grants, totaling $15.5 million, in Maguire's electorate, without reporting her suspicions of his potential corrupt conduct.
Although ICAC did not recommend criminal charges against Berejiklian, she is now pushing back against the findings in the Court of Appeal.
The court will consider the matter on October 9.
It is worth noting that ICAC found Maguire guilty of misconduct, using his public office for personal gain, and deliberately concealing his position and financial benefits.
In a statement released in July, Maguire defended his actions, claiming he worked tirelessly for his constituents and was a strong advocate for improvements in the Wagga Electorate.