Illinois Gastroenterology Group Data Breach Impacts 228K | TechTarget. Optima Dermatology, EvergreenHealth, and SAC Health also faced healthcare data breaches recently. Illinois Gastroenterology Group (IGG) suffered a data security incident that potentially impacted 227,943 individuals. IGG discovered unusual network activity on October 22, 2021. On November 18, IGG determined that an unauthorized actor had gained access to its systems and that “information contained in those systems may have been viewed or taken.”. The systems contained names, birth dates, Social Security numbers, driver’s license numbers, passport information, financial account information, addresses, payment card information, biometric data, employer-assigned identification numbers, and medical information. Third-party company: MyCare.