About 106,000 people were insured in total, most of them through the state-run websites.
The administration originally estimated nearly half a million people would sign up in the first month.
Democrats reportedly expressed frustration about the botched rollout in a White House meeting on Wednesday.
The federal website, used in 36 US states, has been bedeviled by glitches since its 1 October launch.
The administration has pledged that the portal will be “running smoothly” for a “vast majority” of users by the end of November.
Continue reading: http://www.bbc.co.uk/news/world-us-canada-24935411