Among those showing up Saturday was 35-year-old Margo Graham who had triple bypass surgery four years ago. She's a former center for the WNBA's Washington Mystics.
She starts a new job on Nov. 1 and will have insurance.
Oz said he hopes that patients leave with a sense that someone cares about the uninsured.
Texas has the nation's highest uninsured rate and one in every three Harris county adults lacks health insurance.
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