Section 20-2-IV - IMPAIRMENT RATINGA. In determining the extent of permanent impairment attributable to a compensable injury, the provider shall base this determination on the most current edition of the Guides to the Evaluation of Permanent Impairment, as published and copyrighted by the American Medical Association which is in effect at the time the service is rendered. Only a medical doctor is entitled under these rules to reimbursement for conducting an impairment rating evaluation.B. A provider is entitled to reimbursement for conducting an impairment rating evaluation and determining the extent of permanent impairment, and should bill for such services using CPT code 99455. The maximum allowable reimbursement for CPT code 99455 shall be $250.00.