The Wall Street Journal mined a database with extensive information about tax payments that suggests fraud and discovered a New York City doctor who most likely took more than $2 million from Medicare. But the paper could not name her because of strict confidentiality requirements on physician reimbursements. "Known as the Medicare claims database, it is a computerized record of the bills Medicare pays for medical treatment, and it is widely considered the single best source of information on the U.S. health-care system. ...
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