Private contractors in charge of building the federal online health insurance marketplace testified Thursday that the administration went ahead with the Oct. 1 launch of HealthCare.gov despite insufficient testing.

In their first public remarks since the debut of the problem-ridden insurance exchange, executives of the main IT companies told members of the House Energy and Commerce Committee that full tests of the website that should have been carried out months in advance, but began just two weeks before its rollout.

"It was not our decision to go live," said Cheryl Campbell, senior vice president of CGI Federal, which handled most of the project. She said the decision was made by the Centers for Medicare and Medicaid Services, an agency within the Department of Health and Human Services.