462,000 Hawai’i Residents Affected by Data Breach at Navvis & Company. Approximately 462,000 individuals who enrolled in health plans through the Hawaii Medical Service Association (HMSA) have been affected by a data breach Approximately 462,000 individuals who enrolled in health plans through the Hawaii Medical Service Association were affected by a data breach at vendor Navvis & Company. Data breaches have also been announced by Coastal Hospice & Palliative Care and Atlanta Women’s Health Group. Third-party company: Navvis & Company.