Federal health officials were responsible for the problem-pocked start of HealthCare.gov last year because of poor planning and lax oversight of outside contractors, according to government investigators who warned that "significant risks remain" that some Americans could again have trouble buying coverage in the federal health insurance marketplace this fall. Such management failures are the central conclusion of the first report issued by the Government Accountability Office as part of a wide-ranging appraisal of the reasons the computer system was not ready when the marketplace opened in October.
