The league had said Friday that Whitehead should have been penalized for striking Mayfield in the side of the helmet during Sunday's 26-23 overtime win for Tampa Bay.
Mayfield was sliding at the end of a 35-yard scramble when he got hit by Whitehead, who was initially penalized before the officials conferred and decided to pick up the flag -- and one against Mayfield for taunting.
First-year referee Shawn Hochuli made the situation worse by incorrectly announcing Mayfield "was still a runner and therefore is allowed to be hit in the head."
"No words," Mayfield said later in the week about Hochuli's announcement. "Honestly, no words. ... I thought that's why they put the rule in."
Whitehead can appeal to have the fine reduced since it nearly equals an entire game check. Any player can have a fine reduced if it is for more than 25 percent of his weekly pay.
Eagles tight end Dallas Goedert, $10,026 for a chop block.
Information from ESPN's Jenna Laine and Rich Cimini and The Associated Press was used in this report.