Dr. Richard Ferkel performed the surgery in Los Angeles.
Thompson, 30, tore his Achilles last Wednesday during a pickup game in the L.A. area and is expected to miss the entire 2020-21 campaign. He missed all of last season due to a torn left ACL he suffered in Game 6 of the 2019 NBA Finals.
If Thompson doesn't return to action until the 2021-22 season, he'll have gone almost two-and-a-half years without playing an NBA game.
The NBA granted the Warriors a $9.3-million disabled player exception Wednesday, sources told The Athletic's Shams Charania. It reportedly expires on April 19.