More than half of the people who got health insurance coverage through healthcare.gov were new enrollees, according to a top administration official.

Of the total 8.8 million enrollees on healthcare.gov, 53 percent were new, with the rest re-enrolling in the program, Health and Human Services Secretary Sylvia Mathews Burwell said during a Google hangout Wednesday.

Healthcare.gov covers the 37 states that did not set up their own insurance exchange. Burwell did not have re-enrollment and new enrollment figures for the 14 state-run exchanges.

She previously announced that 11.4 million people enrolled in both healthcare.gov and the state exchanges. However, Burwell revised the initial total of new enrollees in federally-run exchanges from 8.6 million reported when open enrollment closed on Feb. 15 to 8.8 million.

Of the 47 percent that re-enrolled in healthcare.gov, 22 percent were automatically re-enrolled and the rest actively sought a new plan, Burwell said.

The total state and federal enrollment figures were above administration estimates for 9 million new enrollees, but below a 12 million estimate from the Congressional Budget Office.

More people could soon join the healthcare ranks, as the administration extended the open enrollment period from March 15 to April 30. The additional period is for people who are subject to the individual mandate penalty for not getting insurance.

People who must pay the 2014 penalty may not know they are on the hook until they file their tax returns. The additional period is to enable those people to avoid the higher 2015 penalty.