Okla. Stat. tit. 85 § 35
Any party to the claim may move to set the cause for trial on a change of condition by filing a Form 9 as provided in Rule 19. The physician's medical report or testimony at the subsequent trial must show that said physician was either the attending, treating or examining physician at the time of the previous award or that the physician has personal knowledge of claimant's condition at that time, or it must show that the physician has examined reports, x-rays and any other medical data referring to claimant's condition at the time of the previous award. A fee of One Hundred Thirty Dollars ($130.00) per action to reopen any case shall be collected by the Court Administrator, pursuant to 85 O.S., Section 368(B), from the party filing a Form 9 seeking to reopen.
Okla. Stat. tit. 85, § 35