Aetna
Advantage Health Solutions
Americhoice
Amerigroup
Anthem Blue Cross
Blue Cross and Blue Shield Association
Blue Cross and Blue Shield of Alabama
Blue Cross and Blue Shield of Massachusetts
Blue Cross and Blue Shield of Michigan
Blue Cross and Blue Shield of Minnesota
Blue Cross and Blue Shield of Nebraska
Blue Cross of Arkansas
Blue Cross of Delaware
Blue Cross of Florida
Blue Cross of Illinois
Blue Cross of Louisiana
Bluegrass Family Health Plan
Blue Cross of North Carolina
Blue Cross of Rhode Island
Blue Shield of California
Blue Shield of Northeastern New York
Carefirst Blue Cross and Blue Shield of Maryland
Cariten
CHA Health
Chinese Community Health Plan
Community Health Plan (MO)
Connecticare
Empire Blue Cross
Excellus Blue Cross
Great West Life
Harvard-Pilgrim Health Care
Harvard-Vanguard Medical Associates
Health Alliance Plan (IL)
Health Alliance Plan (MI)
Health Plan of San Mateo
HealthSpring
Health-First (FL)
Health-First (NY)
HealthNet
HealthPartners
Highmark Blue Cross
HMO Alliance
Humana Health Plans, Inc.
Independence Blue Cross
Independent Health
Kerr Family Health Plan
Martin's Point Health Care
Medica
Memphis Managed Care (TLC Health Plan)
Mercy Health
Metroplus Health Plan
Montefiore Medical Center
Nationwide
Pacificare
Paramount
Parkland Health Plan
PreferredOne
Premera Blue Cross
Presbyterian Health Services
Providence Health Plan
ScanHealth
Security Health Plan
Seton Health Plan
Staywell Health Plan (Guam)
SummaCare
Touchpoint Health Plan
Trinity Health Plans (Michigan and Indiana)
TriWest (Tricare)
United Health Care
UCare
Wellcare
Wellpoint
Wisconsin Physician Services

EMPLOYERS, EMPLOYER FUNDS, and UNIONS:
California Public Employees Retirement System (CalPERS)
Conde Nast Publications
Kentucky State Retirement System
Massachusetts Municipal Association
Ohio State Teachers Retirement Systems
Ohio School Employees Retirement System
Operating Engineers Western Region
Partners Healthcare (MA)
Procter and Gamble
Tennessee Valley Authority
Utah State Employees (Public Employee Health Plan)
WalMart

STATE MEDICAID PROGRAMS:
Alaska
California
Colorado
Florida
Georgia
Illinois
Michigan
Montana
New Hampshire
South Dakota
Tennessee
Texas
Washington
Wyoming

NATIONAL AND PROVINCIAL HEALTH SYSTEMS:
British Columbia
France