HHS is considering new guidance that would advise against regular mammograms.
Burwell declined to offer the administration's backup plan ahead of a high court ruling.
Roughly 9.5 million have chosen plans or reenrolled since Nov. 15.
11.3 percent were uninsured in the first half of this year, down from 14.4 last year.
O-Care ads will now appear on 7-Eleven receipts at more than 7,000 store.
"It's going to be a lot of fun," said a Republican aide.
The figures represent good news for the administration's efforts to control costs.
The American Red Cross and America’s Blood Centers voiced support for the policy change.
Enrollees would be able to choose to be automatically enrolled in cheaper coverage.
The practice is drawing criticism from journalists.
The time is now to stop mountaintop removal mining.
Sen. Casey said HHS already had officials responsible for public health emergencies.
The administration received good news about the health law Monday.
Republicans want the White House to show its hand ahead of a key court challenge.
The president is likely to tout the success of this year's sign-ups.
More than 1 million people logged on in the final day to buy coverage for Jan. 1.
The "stupidity" consultant gave new fuel to attacks on O-Care's transparency.
The "stupidity" consultant could be seated next to officials at a hearing.
Experts say designating certain medical sites Ebola-ready was long overdue.
Roughly 220,000 plans were selected by new customers, according to HHS.
The administration did not meet its target of 7 million sign-ups in the first year.
Josh Earnest said GOP doesn't talk about what's going well for health law.
Burwell said officials could have better overseen safety protocols at the Dallas hospital.
Dems on an appropriations panel say public health cuts could hurt the response.