The administrator of the fund may apportion or deny the employer or insurer reimbursement from the fund for medical expense provided by Code Section 34-9-360 where there are clear and unequivocal facts to establish that the subsequent injury to the permanently impaired employee was not caused by or in any way related to the employee's preexisting disability. The apportionment by the administrator shall be subject to the approval of the State Board of Workers' Compensation.
OCGA § 34-9-364