A special bench of Justice Siddharth Mridul extended the bail while asking the director of Institute of Human Behaviour and Allied Sciences (IHBAS) to file status report related to the medical condition of Kumar.
Kumar was granted bail in June last year over medical grounds.
On January 22, 2013, a special CBI court had convicted and sentenced former Haryana Chief Minister and Indian National Lok Dal (INLD) chief Om Prakash Chautala and his son Ajay along with seven others to 10-year jail term each for illegally recruiting 3,206 junior teachers in 2000.
All of them were held guilty of cheating, forgery, using fake documents as genuine, conspiracy under IPC and of abusing their official position under Prevention of Corruption Act.
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Om Prakash Chautala on October 11 surrendered at Tihar jail.
The high court had on October 10 cancelled his interim bail and had asked him to surrender in 24 hours, after CBI had alleged that Chautala had flouted his bail conditions.
CBI in its plea had said Chautala was busy campaigning for his party for Haryana Assembly elections despite being out on bail on medical grounds.
But the court on October 10 advanced that date and gave him 24 hours to surrender after he was found campaigning for his party.
On July 11, the high court had reserved its verdict on the appeals of 55 convicts, including Chautala and his son Ajay, in the case.