- Aetna
- AIG Claim Service Inc.
- Allied Benefit Systems Inc.
- Amalgamated Life Insurance
- American Family
- American Healthcare Alliance
- American Medical Security
- Bankers Life & Casualty Company
- Beech Street Corp
- Benefit Administrative Systems, LTD
- Benefit Systems & Service Inc.
- Benesight
- Blue Cross & Blue Shield (all plans)
- CCN
- Cement Masons Local No. 502 Welfare
- Central States Joint Board
- Cigna Health Plan
- Concert Health Plan
- CoreSource Inc.
- Employers Health Plan (HFN)
- Fedex Freight Health Plan
- First Health
- Fortis Valley Labores Welfare Fund
- Gallaghar Benefit Administrators
- GE Group Administrators
- Guardian
- Guardian Resources
- Health Care Networks of America
- Health Marketing Inc.
- Health Payors Organization LTD
- Health Preferred of Mid America
- Health Star Managed Care Corp
- Health Administration Service (H.A.S.)
- Healthsmart
- HFN (Healthcare's Finest Network)
- Humana PPO
- Illinois Dept. of Public Aid
- Laborers' Health and Welfare Fund
- Employers Health Plan (HFN)
- Fedex Freight Health Plan
- First Health
- Fortis Valley Labores Welfare Fund
- Gallaghar Benefit Administrators
- GE Group Administrators
- Guardian
- Guardian Resources
- Health Care Networks of America
- Health Marketing Inc.
- Health Payors Organization LTD
- Health Preferred of Mid America
- Health Star Managed Care Corp
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- Health Administration Service (H.A.S.)
- Healthsmart
- HFN (Healthcare's Finest Network)
- Humana PPO
- Illinois Dept. of Public Aid
- Laborers' Health and Welfare Fund
- Managed Care of America
- Medicare
- Medicare Railroad Retirement
- Midwest Operating Engineers Welfare Fund
- NABN
- National Association of Letter Carriers
- National Provider Network
- NGS, American Inc.
- One Health Plan
- Pacific Life & Annuity Benefits Office
- PacificCare
- PBA
- Performax
- Physicians Organizations of America
- Podiatric Independent Physicians Association
- Preferred Health Network Midwest
- Preferred Plan PPO (Pro-America)
- Principal Financial Group
- Principal Healthcare of Illinois
- Principal Life Insurance
- Private Healthcare Systems (One Health Plan)
- Pro-Net (Providers Network of America)
- Providers Plus Inc.
- Railroad Maintenance & Ind H & W Fund
- Self Insured Service Company (SISCO)
- The Hartford Medical Management Center
- The Mega Life & Health Insurance Company
- The Prudential
- Tri Care Anthem Alliance (Champus)
- Trustmark
- United Foot & Commercial Works Union & Employers Midwest Benefits (Through Blue Cross)
- United Health Care (all plans)
- USA Health Network
- USA Managed Care Organization
- W.J. Jones Administrative Services Inc
- Wausau Benefits
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