Koda was admitted to the Intensive Care Unit (ICU) of Apollo Hospital on Tuesday, Nov 3, after he complained of severe stomach ache.
"We cannot say what exactly is the problem. We are conducting tests and we will be able to say anything after the test reports," a doctor at the hospital was quoted as saying in a news agency report.
Koda who is believed to have amassed illegal wealth in tune of Rs 2,000 crore has come under the scanner of the IT department. Earlier, IT department complained that Koda was not co-operating with the interrogations.
However, Koda reportedly had complained of a similar stomach pain about two weeks ago. He was recently discharged from the hospital after he underwent an operation.
But the present development is being seen as Koda's move to avoid authorities and the probe.