A psychologist authorized to treat workers' compensation cases, when requested to supersede another psychologist or a physician, must, before beginning treatment, make reasonable effort to communicate, after obtaining the consent of the patient (or guardian), with the attending psychologist or the physician to ascertain the patient's condition and whether or not there is any injury or condition other than mental, nervous, emotional and behavioral disorders and illnesses. The superseding psychologist must also advise the attending psychologist or physician of the name of the person who has requested him or her to assume care of the case and state the reason therefor. If the superseding psychologist cannot contact the attending psychologist or physician, and the claimant's condition is such as to require immediate treatment, the superseding psychologist should advise the psychologist or physician previously in attendance, within 48 hours, that he or she now has the patient in his or her care and send a copy of such notice to the employer or carrier and to the chair. The superseding psychologist or physician shall supply the superseding psychologist with a complete history of the case.