Mercy, a top U.S. health system, serves millions with quality care, 50+ hospitals, 1,000+ clinics, and $500M in free care in FY23. Mercy, a top U.S. health system, serves millions with quality care, 50+ hospitals, 1,000+ clinics, and $500M in free care in FY23. The mission of the Mercy Health Foundation Oklahoma City is to support and benefit Mercy Hospital Oklahoma City and to further the general charitable purposes of Mercy within the Oklahoma City metropolitan area.