Cominsky was drafted by the Atlanta Falcons in the fourth round (135th overall) of the 2019 NFL draft.[5] He played in 10 games as a rookie, recording 10 tackles and 0.5 sacks.
Cominsky was placed on the reserve/COVID-19 list by the Falcons on October 17, 2020,[6] and was activated on October 30.[7]
On May 26, 2022, Cominsky was released by the Falcons.[9]
Detroit Lions
On May 31, 2022, Cominsky was claimed off of waivers by the Detroit Lions. He played in 14 games with eight starts, recording 30 tackles, four sacks, and three passes defensed.
On March 15, 2023, Cominsky signed a two-year, $8.5 million contract extension with the Lions.[10] In 16 games (11 starts) in 2023, he recorded 36 combined tackles, one pass deflection, and two sacks.
On July 30, 2024, Cominsky suffered a torn MCL in his right knee during a practice, ruling him out indefinitely.[11] He was placed on injured reserve on August 29.[12]