Atrio Health Plan
Blue Cross Blue Shield of Kansas City (BlueKC)
Blue Cross Blue Shield of Arizona
Blue Cross Blue Shield Arkansas
Blue Cross Blue Shield of Michigan
Blue Cross Blue Shield of Minnesota
Blue Cross Blue Shield of Nebraska
Blue Cross Blue Shield South Carolina
Blue Cross of Idaho
Bright Health Plan
Capital District Physicians' Health Plan, Inc.
Centene/Wellcare
Cigna
Devoted Health
Elevance Health
Elixir (Formally Envision Rx)
Excellus BlueCross BlueShield
FirstCarolinaCare Insurance Company/FirstMedicare Direct
Geisinger Health System
HAP Medicare Plans
Health Alliance Medical Plans, Health Alliance
Health First Health Plans
Northwest

HealthPartners
Highmark Health
Humana
McLaren Health Plan/McLaren Health Advantage
Medica
Medical Mutual of Ohio
Moda, Inc.
Molina Healthcare, Inc.
MVP Health Care, Inc.
Network Health, Inc.
Pacific Source Health Plans
PHP Medicare
Prominence Health
Providence Health & Services
Select Health/Intermountain Health Care, Inc.
SIHO Insurance Services
SummaCare 
The Health Plan
UnitedHealthcare
UCare
Universal Care, Inc
Upper Peninsula Health Plan
WellSense Health Plan
Zing Health