ANNAPOLIS, Md. (AP) — Maryland has successfully completed 17 of 21 milestones to revamp the state’s troubled health care marketplace with technology from Connecticut, according to a letter written to Gov. Martin O’Malley.

Marilyn Tavenner, the administrator of the Centers for Medicare and Medicaid Services, wrote in the letter this week that Maryland plans to complete the last several milestones to make the transition in the coming weeks. The state is working to make the new state-based health exchange marketplace ready for the 2015 open enrollment period, and Tavenner wrote that CMS has reviewed the cost and feasibility analyses conducted by Maryland.