HHS Secretary Kathleen Sebelius said Wednesday that there would be no delay of Obamacare’s individual mandate, the penalty for violating it or the March 31 closing date of the enrollment period, the strongest statement yet that the administration has no plans for more major changes to the law in the final weeks of the first sign-up period.

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Sebelius was asked repeatedly whether the administration could say how many people who had enrolled in plans had actually paid their premiums, but she said she couldn’t answer.

“I can’t tell you because I don’t know that,” Sebelius told Rep. Tom Price (R-Ga.).

On Tuesday, HHS said that 4.2 million people had signed up for private insurance plans under Obamacare through the end of February. That’s way off pace for the administration’s initial goal of 7 million enrollments this year, now viewed as unattainable. Even reaching a revised target of 6 million projected by the Congressional Budget Office after the disastrous rollout of HealthCare.gov is a daunting challenge. A new report Wednesday by Avalere Health said reaching the lower goal was highly unlikely, estimating 5.4 million enrollments by the end of March.

The answer to how many of the sign-ups have paid is important because that’s who will have actually gained insurance under the law. The number is bound to be significantly less than those who have simply chosen plans — four large insurers estimated to POLITICO this week that 15 percent to 20 percent of people who signed up hadn’t paid.