Health Net of California notified California AG regarding a breach involving its third-party vendor, Accellion. Between January 7 and January 25, 2021, an unknown malicious party accessed Accellion's file transfer platform, potentially exposing patient names, addresses, DOBs, insurance IDs, and health information. Health Net activated its incident response plan, ceased using Accellion, and provided one year of identity protection services to affected individuals.