(a) All requests for cross-examination of a treating medical provider, independent medical examiner, or a physician designated by the Board to examine a claimant pursuant to section 13(e) of the Workers’ Compensation Law, shall be made in writing using the form prescribed by the Chair to request further action or on the record at a hearing no later than forty-five days from the date the Board received the medical report(s) which is the subject of the cross-examination