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Back on track after a stumbling start, President Barack Obama's heath care overhaul reached a milestone Thursday, with more than聽6 million Americans signed聽up for coverage through new insurance markets.

The announcement 鈥斅爁our days聽before open聽enrollment season ends Monday 鈥� fulfills a revised goal set by the Congressional Budget Office and embraced by the White House.

Like much else about Obama's health care law, it comes with a caveat: The administration has yet to announce how many consumers actually closed the deal by paying their first month's premium. Some independent estimates are that as many as聽10 percent to聽20 percent have not聽paid, which would bring the total enrollment to between聽5 million and聽6 million people.

The White House said the president made the announcement during an international conference call with enrollment counselors and volunteers, while traveling in Italy. Administration officials, focused on signing up even more people over the weekend, played down the occasion. Others said it was unmistakably a promising sign.

"I think the program is finally starting to hit its stride in terms of reaching the enrollment goals the administration set," said John Rother, CEO of the National Coalition on Health Care, a nonpartisan coalition of businesses, health care industry groups and consumer organizations. "It still has a ways to go in terms of achieving public acceptance."

To put the聽6 million sign-ups聽in perspective, consider that the HealthCare.gov website didn't work when it was launched in October. Millions of people trying to access online marketplace exchanges that offer subsidized private insurance were met with frozen screens. Nonetheless, the administration's achievement is still short of the original target of covering聽7 million people through聽the exchanges.

Several million more people have gained coverage through Medicaid. That safety net program was also expanded under the law, but only about half of states have gone along.

Nonetheless, ongoing measurements by Gallup show that the number of Americans without coverage has been slowly dropping since coverage under the law took effect in January.

Monday is the deadline to enroll in the new insurance exchanges, but potentially millions of people will still be able to take advantage of extensions announced this week.

Although the national number is important, what really counts is state-by-state enrollment. That's because each state is a separate insurance market. To help keep premium increases in check, each state market must have a balance between young and old, healthy and sick.

"The national number only gets us so far," said Caroline Pearson, who is tracking the rollout for the market analysis firm Avalere Health. "The fair measure of success is whether you have set up a market that is sustainable into the future. So you can then go out and find the rest of the uninsured people, and bring them in over the next couple of years."

As of just a couple of few weeks ago, it seemed like it would take a miracle of sorts for the administration to hit the聽6 million mark. Enrollment in February was lackluster. But this week especially has seen a resurgence of consumer interest with the enrollment deadline approaching. The administration said HealthCare.gov got 1.5 million visits on聽Wednesday.

Health and Human Services Secretary Kathleen Sebelius has been traveling constantly to promote sign-ups. Obama himself joined in reaching out to Hispanics, a large and relatively young population that has been sitting on the sidelines.

Achieving the聽6 million level was聽a relief to congressional Democrats. The law remains unpopular with the public, and Republicans are making its repeal their rallying cry in the upcoming midterm elections.

"The Affordable Care Act is working," House Democratic leader Nancy Pelosi of California asserted in a statement. "Republicans should abandon their reckless pursuit of new milestones in the number of votes to repeal or undermine this historic law." The GOP-led House has voted more than聽50 times to repeal, defund or scale back the law.

Some Democratic lawmakers were hedging their bets.聽Five Democrats and one聽independent 鈥斅爐hree facing re-election聽鈥� introduced a package of changes to the law Thursday, including聽one to spare companies聽with fewer than聽100 employees from a聽requirement to provide coverage to their workers. The current cutoff is 50.

The Senate legislation was drafted by Democrats Heidi Heitkamp of North Dakota, Mary Landrieu of Louisiana Mark Begich of Alaska, Mark Warner of Virginia and Joe Manchin of West Virginia, along with Angus King, a Maine independent.

Citing the uncertainty over how many people have actually secured coverage by paying their premiums, market analyst Pearson suggested celebrations are premature.

"It matters politically," she said. "It doesn't matter from a market perspective."

AP Special Correspondent David Espo contributed to this report.

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