President Obama's top health care official told Congress on Wednesday that she's responsible for the "debacle" of cascading technical problems plaguing HealthCare.gov.

The Obama administration is trying to lower expectations for strong initial enrollments under the president's historic expansion of health coverage for the medically uninsured.

Stressing that improvements are happening daily, the senior Obama official closest to the administration's malfunctioning health care website apologized Tuesday for problems that have kept Americans from successfully signing up for coverage.

Medicare Chief Marilyn Tavenner will be questioned Tuesday by the House Ways and Means Committee not only on what went wrong with HealthCare.gov, but also whether lawmakers can trust Obama administration promises to have things running efficiently by the end of November.

The Obama administration says its granting a six-week extension until March 31 for Americans to sign up for coverage next year and avoid new tax penalties under PPACA.

Nearly a month into a dysfunctional health care rollout, Obama administration officials said Friday they have identified dozens of website problems that need fixing and tapped a private company to take the lead.

Nearly a month into the health care rollout and no end in sight to computer problems, the Obama administration says it's finally getting someone outside the government to take the lead.

Contractors who built the web portal for the Obama administration's health insurance marketplace said Thursday the site's crippling problems trace back to insufficient testing and changes that government officials made just prior to going live.