Call Nurse Navigator at 800-843-6705 or email Nurse Navigator at nursenavigator@gpatpa.com. You can also contact the PHCS/Multiplan Network Services directly at 1-877-312-7427 or go to their website at www.multiplan.com.  If you live in the Dallas/Ft. Worth area, contact IMS Network Services directly at 1-800-853-7003 or go to their website at www.imsppo.com.