Arizona’s Medicaid program, AHCCCS, inadvertently sent misaddressed emails containing private health information to 3,177 individuals on August 29, 2023. The breach, initially believed to be related to a physical mailer, was later confirmed as a human error during the preparation of an email distribution list via Constant Contact. The exposed data included recipients' names, AHCCCS identification numbers, and health plan names, though no Social Security numbers, financial data, or clinical details were compromised. The issue was flagged by a member who received a letter addressed to someone else, prompting AHCCCS to halt its mailing process and launch an internal investigation. While the agency notified affected members and implemented stricter quality assurance safeguards for future communications, the incident highlights vulnerabilities in data handling procedures. Affected individuals were advised to monitor their credit reports and report suspicious activity to law enforcement or AHCCCS. The breach underscores the risks of human error in digital communication systems, particularly when handling sensitive health-related data under government programs.