Insurance Code § 11580.02
ARTICLE 2. Actions on Policies Containing Liability Provisions
A liability insurer may review bills submitted for the defense of its insured, but shall not compensate a reviewer based on any of the following:
(a) A percentage of the amount by which a bill is reduced for payment.
(b) The number of claims or the cost of services for which the reviewer has denied authorization or payment.
(c) An agreement that no compensation will be due unless one or more bills are reduced for payment.