20 CFR §725.713

Where a provider submits a bill to OWCP and OWCP has reduced the provider's fee, the miner is not responsible for any additional payment for services or treatments covered under this subpart. Thus, a provider whose fee for service is partially paid by OWCP as a result of the application of the provisions of §§ 725.707-725.711 or otherwise in accordance with this subpart may not request reimbursement from the miner for additional amounts.