Dwyer was assessed three automatic suspensions - 10 games for physical abuse of officials, 10 games for leaving the penalty box, and three games for three game misconduct penalties for his actions during the Lightning's Sept. 19 game against Washington.
The NHL said Dwyer applied physical force to linesman David Brisebois during an altercation with Washington's Joe Murphy and Joe Reekie. After leaving the penalty box, Dwyer then pulled referee Mark Faucette to the ice in an attempt to fight Reekie.
Dwyer was given minor penalties for charging and roughing, a 10-minute misconduct penalty, and the three game misconduct penalties.
Dwyer, who has served two games of the suspension, will miss the first 21 games of the regular season, costing him $39,511 in pay. He will be eligible to return Nov. 27 against the New York Islanders.
Dwyer, 22, had one assist and 135 penalty minutes in 24 games last season as a rookie.
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