· HEALTH INSURANCE MARKETPLACES 2017 OPEN ENROLLMENT PERIOD Final enrollment report: November 1, 2016 â January 31, 2017. This report summarizes enrollment activity in the individual Marketplaces [1] during the 2017 Open Enrollment Period (2017 OEP) for all 50 states and the District of Columbia. Approximately 12.2 million [2] consumers selected or ….