The party requiring the attendance shall either accompany the service of the subpoena or notice with a tender of the expert's fee based on the anticipated length of time the expert is required to remain at such place pursuant to the notice or subpoena or tender that fee at the required time of appearance. The expert's fee shall be delivered to the attorney for the party designating the expert. If the appearance of the expert takes longer than anticipated, the party serving the subpoena or notice shall pay the balance of the expert's fee within five days of receipt of an itemized statement from the expert. The party designating the expert is responsible for any fee charged by the expert for preparing for the testimony and for traveling to the place of the civil action or proceeding, as well as for any travel expenses of the expert, unless otherwise determined by the court.
In any such attempt at an informal resolution, either the party or the expert shall provide the other with (A) proof of the ordinary and customary fee actually charged and received by that expert for similar services provided outside the subject litigation, (B) the total number of times the presently demanded fee has ever been charged and received by that expert, and (C) the frequency and regularity with which the presently demanded fee has been charged and received by that expert within the two-year period preceding the hearing on the motion. Provisions (B) and (C) shall apply to actions filed after January 1, 1994.
In addition to any other facts or evidence, the expert or the party designating the expert shall provide, and the court's determination as to the reasonableness of the fee shall be based upon, (1) proof of the ordinary and customary fee actually charged and received by that expert for similar services provided outside the subject litigation, (2) the total number of times the presently demanded fee has ever been charged and received by that expert, and (3) the frequency and regularity with which the presently demanded and any other fee has been charged and received by that expert within the two-year period preceding the hearing on the motion. The court may also consider (4) the ordinary and customary fees charged by similar experts for similar services within the relevant community, and (5) any other factors the court deems necessary or appropriate to make its determination.
Upon a determination that the fee demanded by that expert is unreasonable, and based upon the evidence and factors considered, the court shall set the fee of the expert providing testimony.
Ca. Gov. Code § 68092.5