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Health insurance plans only count subscribers as enrolled in a health plan once they’ve submited a payment. That is when the carrier sends out a member card and begins paying doctor bills.

When the Obama administration releases health law enrollment figures later this week, though, it will use a more expansive definition. It will count people who have purchased a plan as well as those who have a plan sitting in their online shopping cart but have not yet paid.

“In the data that will be released this week, ‘enrollment’ will measure people who have filled out an application and selected a qualified health plan in the marketplace,” said an administration official, who requested anonymity to frankly describe the methodology.

The disparity in the numbers is likely to further inflame the political fight over the Affordable Care Act. Each side could choose a number to make the case that the health law is making progress or failing miserably.

On Monday, the Wall Street Journal, citing anonymous sources, said insurance companies have received about 50,000 private health plan enrollments through HealthCare.gov. Even combined with state tallies, the figure falls far short of the 500,000 sign-ups the administration initially predicted for both private sign-ups and those opting for the expansion of Medicaid.

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In recent weeks, administration officials have warned that the enrollment figures for October would be low, given the tumultuous launch of the health Web site.

The administration plans to use this count of enrollees because that's where their interaction with the healthcare.gov site ends, the administration official said.

Addressing the Wall Street Journal’s report, Health and Human Services spokeswoman Joanne Peters said: “We cannot confirm these numbers. More generally, we have always anticipated that initial enrollment numbers would be low and increase over time. . . . The problems with the Web site will cause the numbers to be lower than initially anticipated.”

States that have so far released enrollment data also tend to use this wider definition. The 14 states running their own insurance marketplaces have reported 49,000 enrollments in private health insurance plans, according to an analysis released Monday by consulting firm Avalere Health. They have also enrolled many thousands more into the Medicaid program, which the health-care law expanded.

"The idea that people are going to do layaway purchasing three months out goes against the American way," Rhode Island exchange director Christine Ferguson said in late September, shortly before the health law's rollout.

Different definitions of enrollment lead to vastly different estimations of who will gain coverage under the Affordable

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