Johnson was cited by the Match Review Panel for his high bump on Pearce Hanley in Sunday's loss to the Brisbane Lions at the Gabba.
The incident was assessed as negligent conduct, medium impact and high contact, drawing 225 demerit points and a two-game ban.
However, the total was increased to 279.04 when Johnson's carryover points were added, meaning he could not reduce the penalty to one-game with an early guilty plea.
The triple premiership star was suspended for one match earlier this season for striking Fremantle's Hayden Ballantyne during the NAB Cup.
