He was immediately assigned on an amateur try-out to begin his professional career and finish the duration of the season with AHL affiliate, the Lake Erie Monsters.

Amongst the top offensive producers on the Monsters, Carey was recalled by the Avalanche on multiple occasions and on February 15, 2015, in his 17th career game he recorded his first NHL point, an assist, in a 5–2 victory over the Arizona Coyotes.

[8] On March 2, 2015, Carey was traded by the Avalanche along with Maxime Talbot to his hometown team, the Boston Bruins, in exchange for Jordan Caron and a 6th-round draft pick in 2016.

After two seasons within the Capitals organization, Carey left as a free agent to sign a one-year, two-way contract with the New York Rangers on July 1, 2017.

[12] After enjoying a solid training camp and pre-season with the Rangers, and with Jesper Fast injured, Carey was named on the opening night roster to begin the 2017–18 season for the first time in his career.

As a free agent in the following off-season, Carey left the Rangers to sign a one-year, two-way contract with the Ottawa Senators on July 1, 2018.

[16] After 29 games in Belleville, Carey was traded by Ottawa and acquired for a second time by the Boston Bruins in exchange for Cody Goloubef on January 11, 2019.