Accident Compensation Act 2001, s 148
ACC is responsible for costs relating to reviews. When the reviewer provides a review decision, the reviewer:
must award costs and expenses to the you, the applicant, when the matter is resolved in your favour
has discretion to award other costs and expenses to any other person, when the matter is resolved in your favour
has discretion to award you costs and expenses even if the matter is not resolved in your favour, if the reviewer thinks that the applicant acted reasonably in asking for the review.
If ACC revises its decision in your favour before the hearing, ACC must award you costs and expenses. In this situation, ACC should award the costs and expenses that would have been awarded by a reviewer had the review proceeded. This applies whether or not a reviewer is appointed and whether or not a hearing has been scheduled.