[3] Fagemo made his Swedish Hockey League (SHL) debut in 2017, playing two games with Frölunda HC in the 2017–18 season.

[4] Although Fagemo went undrafted into the National Hockey League, he was invited to the Arizona Coyotes development camp prior to the 2018–19 season as a free agent.

After attending the Kings development camp, on 11 July 2019, Fagemo was signed to a three-year, entry-level contract with Los Angeles.

[10] Remaining on the roster to begin the 2023–24 season, Fagemo made his debut with the Predators and opened the scoring in a 5-1 victory over the San Jose Sharks on October 21, 2023.

[11] As a frequent healthy scratch, Fagemo made 4 appearances with the Predators before he was returned to waivers and re-claimed by the Kings on November 11, 2023.