Medical billing company MCBS this week confirmed it notified at least 309,309 people of a September 2025 data breach that compromised the following personal info: Names Social Security numbers Medical history Mental and physical conditions Treatment and diagnosis info Health insurance numbers and info Dates of birth Addresses MCBS notified 295,625 people in South Carolina, 13,302 in Texas, and 382 in Massachusetts. The figures do not include breach victims in MCBS’ home state, Georgia.