Indian Health Center of Santa Clara Valley notified patients of a data breach originating from third-party vendor Trizetto Provider Solutions. An unauthorized actor accessed historical eligibility transaction reports on Trizetto's web portal from November 2024 to October 2025. Affected data includes PHI, SSNs, and demographic information. No financial data was compromised. Trizetto engaged Mandiant, contained the threat, and is offering credit monitoring via Kroll.