Centrelake Medical Group, Inc., a subsidiary of AltaMed Health Services Corporation, reported a ransomware incident affecting patient records. The breach occurred between January 9, 2019, and February 19, 2019, when a virus prohibited access to files containing PHI and PII (SSN, driver's licenses). No evidence of actual data misuse was found, but unauthorized access was possible. The company engaged third-party forensics, restored systems, and offered credit monitoring.