December 15th, 2016 was the last day to enroll in coverage that started by January 1st, 2017, but 42 states have expanded the deadline to the 17th or 19th. Open enrollment 2017 ends January 31st, plans purchased after the December 15, 17, or deadline will start February 1st or later.
- Colorado, District of Columbia, Idaho, Maryland, Minnesota, Vermont: Thursday December 15
- Healthcare.gov states (Alabama, Alaska, Arizona, Arkansas, Delaware, Florida, Georgia, Hawaii, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Michigan, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, South Carolina, South Dakota, Tennessee, Texas, Utah, Virginia, West Virginia, Wisconsin, Wyoming): Monday December 19
- California, Connecticut, New York: Saturday December 17
- Massachusetts, Rhode Island, Washington State: Friday December 23