This case study explains how a major U.S. managed healthcare provider secured more than 500,000 IoMT, IoT, and OT devices across hundreds of hospitals and clinics. Infusion pumps, patient monitors, printers, HVAC systems, cameras, access controllers, and other essential assets were exposed through default passwords, insecure services, vulnerable firmware, and expired certificates. Previous efforts had not produced an accurate inventory or scalable remediation process. Phosphorus delivered high-fidelity discovery and risk assessment within minutes, then automated credential rotation, firmware upgrades, secure configuration enforcement, and service removal without disrupting patient care. The provider achieved a compliant environment in weeks, reduced ransomware exposure, improved patient sa

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