These researchers analysed sport-related concussion and associated costs in New Zealand requiring medical treatment from 2001 to 2011 in 7 sports codes. Of 20,902 claims costing $NZD16,546,026 recorded over the study period, 1330 (6.4%) were moderate-to-severe (MSC) Accident Compensation Corporation (ACC) claims. The mean yearly number and costs of MSC claims were 133 and $1,303,942. Rugby union recorded the highest number of MSC claims per year (38; 95% CI, 36 to 41 per 1000 MSC claims). New Zealand Māori had the highest total ($6,000,759) and mean cost ($21,120) per MSC claim.