Aetna, Premera Blue Cross, Regence Blue Shield, Carpenter's Trust, CCN Managed Care, CHPW, DSHS, Cigna, EBMS, Eye Benefits, First Choice, Great West Health-Care, Health Net, HMA, L & I, Life Wise, Lumenos, Molina, Multiplan, Mutual of Omaha, Northwest Benefits Network, NW Sheet Metal, Pacific Care, Painter's Health & Welfare, Plumbers Pipe & Fitters, Private Health Care Systems, Puget Sound Electrical Workers, RBMS, Regence Blue Shield, Retail Clerks, Tricare, Uniform Medical Plan, United Health Care, United Medical Resources, VSP, Washington Employer's Trust (WET), Zenith Administrators