A senior official at the Centers for Medicare and Medicaid warned colleagues on July 16 he was worried the online enrollment system could "crash" upon its Oct. 1 launch, according to new documents released Friday by the House Energy and Commerce Committee.

In an e-mail to his colleagues in which CMS officials discussed whether to give one of the primary contractors GCI Federal another $38 million to work on HealthCare.gov through February 2014, CMS deputy chief information officer Henry Chao questioned whether to provide the contractor with more money.

“I just need to feel more confident they are not going to crash the plane at take-off, regardless of price," Chao wrote.