2026 Community Health Systems Inc. (California) - network access exposed PII and PHI
Data compromised
Names, addresses, emails, phone numbers, dates of birth, SSNs, financial account information, driver license/state ID numbers, treatment/diagnosis information, prescriptions, dates of service, provider names, medical record numbers, patient IDs, Medicare/Medicaid IDs, insurance information, and billing/claims data
Technical writeup
Community Health Systems Inc., a Southern California healthcare provider, disclosed that it was alerted to unusual activity on a computer around February 28, 2026. An investigation with third-party cybersecurity specialists identified potential unauthorized access to data stored on its network. Public summaries tied the disclosure to an April 29, 2026 media advisory and said the review remained ongoing, with no total affected population publicly disclosed at the time.
Root cause
Unauthorized network/computer access detected after unusual activity; investigation ongoing