Centers for Medicare and Medicaid Services Administrator Dr. Mehmet Oz on Wednesday questioned the legitimacy of Affordable Care Act coverage for many Americans, saying that “half” of the people enrolled in the subsidized health insurance plans “filed no claims last year.”

Watch Oz’s remarks in the video player above.

More than 24 million Americans rely on the ACA for health insurance, with the battle over extending subsidies a key sticking point in negotiations between lawmakers on Capitol Hill as the government shutdown continues with no end in sight.

“I have to ask myself — you should be as well — if I had insurance, why would I never use it?” Oz told a reporter during an announcement about drug pricing . “The concern that has been raised is that a large number of the 12 million

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