Reddy was charged in November with breaching three counts of the sport's anti-corruption code during the ongoing franchise-based Abu Dhabi T10 League, and was provisionally suspended.
Reddy, 26, was found guilty by a tribunal of attempting to fix or improperly influence matches, trying to get another player to participate in the same activities and deleting data and messages from a mobile device relevant to the investigation.
"The ban is backdated to 21 November 2025," the ICC said in a statement, adding that Reddy's attempt to influence another player to participate in corrupt activities did not succeed.
Reddy last played for the US in April 2025.