The Medical Board of California notified individuals that a document containing their full name, date of birth, and last 4 digits of SSN/ITIN was erroneously uploaded to an unauthorized location between March 22, 2024, and October 17, 2024. The Board became aware of the breach on October 21, 2024. The incident is classified as an error involving misdelivery of data. The Board is investigating and revising policies to prevent recurrence.