(a) IROs must bill utilization review agents or payors, as appropriate, directly for fees for independent review.(b) IROs may also bill utilization review agents or payors, as appropriate, for copy expenses related to reviews as set out in §12.205 of this chapter.(c) Utilization review agents or payors, as appropriate, must pay IROs directly within 15 days of receipt of invoice. For workers' compensation network and nonnetwork disputes, the IRO fees must be paid under §133.308 of this title.(d) Utilization review agents may recover from the payors the costs associated with the independent review.