Okla. Stat. tit. 85A, § 85A-55: Unreasonable charges

A. If an employer or carrier believes that a charge for medical

services or supplies under this act is unreasonable, it may submit

the charge to the Commission for review. If the Commission

determines that the charge is unreasonable, it may amend the charges

to reflect the Fee Schedule established under Section 50 of this

act, if applicable, or in accordance with reasonable market rates

for the services or supplies provided.

B. The provisions of this section relating to charges shall not

apply if a written contract exists between the employer and the

person who renders the medical service or supplies.