ADVANTAGE, AETNA, ANTHEM, AHN, ARNETT, BEECHSTREET, CCN, CHOICECARE, HUMANA, CIGNA, CHAMPVA, COMMUNITY HEALTH ALLIANCE, CORVEL, ENCORE, ENCIRCLE, FIRST HEALTH, FPN, GALAXY, GREAT WEST, IHN, JOHNSON COUNTY NETWORK, LUTHERAN PREFERRED, MDWISE, MEDICAID, MPLAN, MHS, MULTIPLAN, NATIONAL PROVIDER NET, NYHART, PHCS, PLAN VISTA SOLUTIONS, PPOM, PPONEXT, PROHEALTH, SHO RISK REFERRAL, SAGAMORE, SIHO, SUBURBAN, THE PREFFERED PLAN, TRICARE, UNITED HEALTHCARE, UNICARE