Expenses shall be limited to those usual and customary charges as determined by the Administrator, for similar services. Charges believed to be excessive or unnecessary may be denied by the Administrator. Any institution or person rendering treatment to a worker under this Act agrees to be bound by such charges as allowed by the Administrator and shall not recover in law or equity any amount in excess of that set by the Administrator. ONCA 12-76, eff. Oct. 1, 2012.