Open enrollment for consumers to buy health insurance through the Access Health CT marketplace begins Sunday, and 2016 will bring considerably steeper fines for consumers who lack insurance. Access Health CT (AHCT), now in its third year, enrolled close to 100,000 individuals in private insurance plans in its first two years, according to Andrea Ravitz, director of marketing. About 500,000 enrolled in Medicaid through AHCT, during the first two years. The marketplace aims to enroll between 105,000 and 115,000 in private plans by the end of open enrollment, Ravitz said. AHCT concentrated on attracting new enrollees its first two years but this year it has been focusing on retaining enrollees, she added.