More than 250 sports-related concussion or brain injuries were reported in the Western Bay of Plenty from 2011 to 2013, costing ACC more than $200,000.
It said the number of claims was highest in 2013 at 109, which cost $62,765.
Bay of Plenty Rugby Union chief executive Mike Rogers said the increasing number of claims was due to greater awareness and education about concussions, resulting in better reporting of injuries.
"Twenty or 30 years ago, there was no awareness of the issues of head knocks so guys would just keep playing the game," he said.
"If that means there's an increase in the number of reported injuries, I think that's really positive."