Deibold sustained a head injury during a qualifying race at last weekend's Cortina d'Ampezzo World Cup in Italy. The 35-year-old said in a statement he was "heartbroken" to miss the Games.
Vedder, 23, will make his Olympic debut. The Pinckney, Michigan, native is a five-year member of the U.S. snowboard team, the 2016 Youth Olympic gold medalist and the 2018 world junior champion.
Last January, he just missed earning his second career podium after a fourth-place finish at a Chiesa in Valmalenco World Cup event in Italy. He was runner-up in 2018 during a World Cup race about 100 miles west in Cervinia.
Vedder posted a photo of himself standing near the Olympic rings with the caption, "Dreams do come true." In a since-expired post to his stories, he wished Deibold a speedy recovery and pledged to represent him and his family well at the Winter Olympics.