Whenever a petition to reduce an award, based upon a permanent disability rating which has become final, is denied, the appeals board may order the petitioner to pay to the injured employee all costs incident to the furnishing of X-rays, laboratory services, medical reports, and medical testimony incurred by such employee in connection with the proceeding on such petition.
Source:
Section 4555.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=LAB§ionNum=4555.5..