The $5,000 fine "is considered stiff by MLB standards," Heyman reports.
Molina, 32, has played all 11 of his major-league seasons for the Cardinals and has made six straight NL All-Star appearances. A career .284 hitter with 96 home runs and 584 RBI, Molina has three hits in 15 at-bats this postseason.
Game 1 of the NLCS is at 8 p.m. ET on Saturday.
- Chris Mascaro