MCBS, LLC

MCBS, LLC, a medical billing services provider, notified the California Attorney General of an unauthorized access incident. An unauthorized individual gained access to the network between September 22 and September 26, 2025. MCBS learned of the incident on September 25, 2025, and confirmed data exfiltration on May 28, 2026. Affected data includes PHI, health records, and PII (including SSNs). The company engaged forensic investigators and is offering identity protection services.

MCBS, LLC notified the New Hampshire Attorney General of a security incident affecting 135 NH residents. Unauthorized access occurred between Sept 22-26, 2025, discovered Sept 25, 2025. Personal and health data (SSN, DOB, medical info) were potentially accessed. MCBS engaged forensic investigators, contained the breach, and offered 12 months of credit monitoring.

Affected (this filing): 135