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The former prime minister's lawyer Yudistra Darma Dorai said the appeal was filed on Thursday last week.
Tommy's lawyer Mervyn Lai confirmed the matter.
However, he said the Court of Appeal had yet to set a date on the case.
On Oct 22, last year, Najib filed a civil suit demanding RM1.9 million in damages against Tommy and the government of abuse of power, claiming Thomas had allegedly abused his powers to prosecute him, including the misappropriation of 1Malaysia Development Berhad (1MDB) funds.
On Nov 25, High Court judge Datuk Ahmad Bache allowed Thomas's application to dismiss the former prime minister's lawsuit.
In his decision, Ahmad said Thomas had made the right call in charging Najib for corruption.
In his statement of claim, Najib had said he was wrongfully accused in court over four 1MDB-related cases, claiming it was part of a move planned in advance by Thomas, which was in line with the Pakatan Harapan government's agenda at the time.
Najib claimed that in 2015, Thomas met Tun Dr Mahathir Mohamad over Najib's alleged crimes and mismanagement involving 1MDB funds.
Najib is currently serving a prison sentence after the Federal Court upheld his conviction and sentence of 12 years' jail and a RM210 million fine upon being found guilty of embezzling RM42 million in funds belonging to SRC International.
Najib is now on trial for multiple corruption charges involving the 1MDB financial scandal, audit tempering, and money laundering.
