A hack of health-care data involving a medical bill collector and two major diagnostics companies has grown to almost 20 million people, and is now attracting more questions from a key member of Congress. U.S. Senator Mark Warner, a Virginia Democrat who is a leading cybersecurity advocate in Congress, wrote Quest Diagnostics Inc. asking about the breach, saying that contractors like the American Medical Collection Agency, an Elmsford, New York-based collections firm,were a frequent target.
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