In a data breach disclosure filed with the Maine Attorney General’s office, U.S. healthcare giant Blue Shield of California confirmed more than 63,000 customers may have been affected by a recent ransomware attack.

In early February Brightline Medical Associates, a Blue Shield of California provider, reported that Brightline’s subcontractor, Fortra, LLC, suffered a security incident in January. According to the company website, Brightline offers virtual behavioral health coaching and therapy for children aged 18 months to 17 years old.