President Barack Obama thanked Kathleen Sebelius for helping pass the 2010 health-care law and named Sylvia Mathews Burwell his new health secretary, calling her a proven manager who knows how to deliver results.

After topping initial enrollment projections for PPACA, Kathleen Sebelius leaves her successor, Sylvia Mathews Burwell, an agency with numerous challenges to ultimately make the law work.

Kathleen Sebelius will resign just as PPACA topped its first-year enrollment goal, according to two people familiar with the decision.

About 400,000 people signed up for private health insurance under PPACA since a deadline passed that was initially supposed to end enrollment.

Doctors denounced the accuracy and value of data listing $77 billion in Medicare payments to 880,000 medical providers, while consumer and industry groups said it could make the health-care system more cost-effective.

UnitedHealth Group Inc. and Humana Inc. are among the carriers that will see their base government payment rate reduced 4 percent next year for Medicare Advantage programs for elderly Americans.

More than 1 million people waited until the last five days to sign up for 2014 health coverage under Obamacare, and early indications are that many were young minorities, insurance analysts and enrollment groups said.

Medicare, the U.S. health plan for the elderly and disabled, for the first time will release data on its payments to individual physicians.