- Anne Arundel County Department of Health
- Arizona Health Care Cost Containment System
- Baltimore Medical System
- Baltimore Washington Medical Center
- California Department of Health Services
- CareFirst BlueCross BlueShield
- Clarity Vision
- Commonwealth of Virginia's Department of Medical Assistance
- DC Chartered Health Plan
- Delmarva Foundation for Medical Care, Inc.
- Hanover Hospital
- Health Services for Children with Special Needs, Inc. (HSCSN/NET)
- Highmark (Pennsylvania BlueShield)
- Johns Hopkins Medicine
- Loudoun Hospital
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- Maryland Department of Health and Mental Hygiene
- Maryland General Hospital
- Maryland Hospital Association
- Montgomery General Hospital
- National Institutes of Health (NIH)
- Office of Vermont Health Access
- Ohio Department of Job and Family Services
- Saint Louis ConnectCare
- Shady Grove Adventist Hospital
- Sierra Military Health Services
- Suburban Hospital
- United Concordia Companies, Inc. (UCCI)
- University of Maryland Medicine
- Viable Information Processing Systems
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