Nationals pitcher Stephen Strasburg appeared to have a sixth-inning single against the Dodgers on Sunday afternoon before Bellinger, playing close, fired a bullet to first baseman Max Muncy.
The play was held up for a replay review.
"I didn't know if it was out or safe, I just threw it as hard as I could," Bellinger told reporters.
Statcast tracked his throw at 93 mph.
The play preserved pitcher Hyun-Jin Ryu's no-hit bid. Ryu lost the no-hitter in the eighth inning when Nationals first baseman Gerardo Parra doubled.
Bellinger has emerged as an early-season National League MVP candidate. The 23-year-old is hitting .407, with 14 home runs and 38 RBIs in 41 games.