He made his NHL debut on 9 March in a 5–3 victory over the Winnipeg Jets[12] He scored his first goal two nights later against Matt Hackett of the Minnesota Wild.

[14] Bärtschi was the top scorer of the 2012 WHL playoffs, recording 34 points in 22 games, to lead Portland to their second consecutive appearance in the league championship series.

[15] Bärtschi turned professional in 2012–13, and due to an NHL labour dispute, began the season with Calgary's American Hockey League (AHL) affiliate, the Abbotsford Heat.

He was previously checked in the head by Vegas Golden Knights player Tomas Hyka during a game on 24 October 2018.

[24] Following his seventh year within the Canucks organization and not featuring at the NHL level for the 2020–21 season, Bärtschi left as a free agent to sign a one-year, two-way contract with the Vegas Golden Knights on 28 July 2021.

[25] After spending most of the 2021–22 season with Vegas's farm team, the Henderson Silver Knights, Bärtschi returned home to play in Switzerland by signing a three-year deal with SC Bern of the NL.

He played in the Under-18 world championship in 2009 and 2010, scoring a goal and two assists in both tournaments for Swiss teams that finished in 8th and 5th place respectively.

He then appeared with the under-20 team at the 2011 World Junior Ice Hockey Championships, scoring a goal and an assist in another fifth-place finish.