- AETNA PPO
- ALLIED BENEFIT SYSTEMS
- AMERICAN BENEFIT SYSTEMS
- ANTHEM BLUE CROSS BLUE SHIELD
- AUXIANT
- BEECH STREET
- BLUE CROSS BLUE SHIELD PPO
- BENEFIT ADMINISTRATIVE SYSTEMS
- CARECENTRIX
- CAREMARK
- CHRISTIAN BROTHERS
- CINERGY HEALTH INSURANCE
- CIGNA
- CONTINENTAL CASUALTY COMPANY (CAN)
- CONCERT HEALTH PLAN
- CORESOURCE
- COVENTRY FIRST HEALTH MAILHANDLERS
- CYPRESS CARE
- DEPT. OF VETERANS AFFAIRS
- ENCOMPASS
- FIRST CALL PHARMACY
- GALLAGHER BASSET
- GENTIVA
- GREAT WEST LIFE AND ANNUITY INSURANCE
- GUARDIAN
- HAA PREFERRED PARTNERS
- HARVARD PILGRIM
- HEARTLAND INFUSION SERVICES
- HEALTHLINK
- HEALTHSPRINGS
- HEALTHPAYERS USA
- HINES VA
- HOMELINK
- HUMANA PPO
- HUMANA GOLD CHOICE MEDICARE
- HUMANA HEALTHCARE
- JOHN HANCOCK
- MEDCARE MANAGEMENT
- MEDICAID
- MEDICARE
- MERITAIN HEALTH
- MSC CARE MANAGEMENT
- MULTIPLAN
- NEW ENGLAND LIFE INSURANCE
- NGS AMERICAN INSURANCE
- PMA INSURANCE
- PMSI
- PRIVATE HEALTH CARE SYSTEMS (PHCS)
- PHCS ALLIED BENEFITS
- PHCS AMERICAN COMMUNITY MUTUAL
- PHCS CAN
- PHCS MIDWEST NATIONAL
- STERLING LIFE
- TRUSTMARK
- TRICARE HEALTHNET
- UNITED HEALTHCARE