He was suffering from "renal (kidney-related) dysfunction", a hospital official said.
72-year-old Kadam was admitted to the hospital last week, he added.
Founder of Bharati Vidyapeeth Deemed University and several other educational institutes, Kadam has been a staunch Congressman for several years. He held portfolios such as cooperation and forest in the Congress-NCP government during 1999 to 2014.
A Congress leader who visited Kadam in the hospital today said that according to doctors, his condition was stable.
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