Since recording 11.7 million health care sign-ups by the end of the open enrollment period in February, Obamacare has witnessed a plunge of 1.5 million who failed to pay their premiums or simply dropped off, the administration announced this week.

Coverage under the Affordable Care Act (ACA) this year thus totals 10.5 million, up from 6.3 million in 2014. Some 85 percent of all enrollees receive federal subsidies to help pay their premiums.

Despite the plunge, Health and Human Services Secretary Sylvia Mathews Burwell announced, “The health insurance marketplaces are working.”

The Supreme Court, however, will weigh in this month on whether premium subsidies offered at the federal level are legal under the wording of the ACA, potentially stripping at least 7.5 million policyholders of their support system.

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