Health and Human Services secretary Kathleen Sebelius held a conference call Wednesday afternoon to tout the fact that 3.3 million Americans have signed up for health insurance plans through the Obamacare exchanges. But Sebelius and other HHS officials declined to say how many of those Americans have actually paid their premiums, a requirement for enrollment.

"As soon as we have our automated payment systems complete and tested, we believe that we'll be able to provide you some additional data about those consumers who have paid their premiums," said HHS spokeswoman Julie Bataille. An email to an HHS spokesman asking when the payment system would be completed was not immediately returned.

Asked by one reporter to respond to a McKinsey report that only 11 percent of people who signed up for Obamacare were previously uninsured, an HHS official said they don't have any information regarding the matter. "We're certainly encouraged by the Gallup data" that the percentage of uninsured Americans is 16.1 percent, said one HHS official.

According to that same Gallup poll, the percentage of uninsured has hovered around 16 percent in the month of January for three out of the last four years.

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