Lifespan Physicians Group of Massachusetts, doing business as Brown Health Medical Group-MA, disclosed a data breach affecting nearly 312,000 individuals after unauthorized access to a legacy file server occurred on December 15–16, 2025. The exposed data may include names, dates of birth, contact information, Social Security numbers, government IDs, financial information, and medical or employment-related records. The organization contained the incident, enhanced security measures, and offered affected individuals 24 months of credit monitoring and identity protection services.