AMCA has said that it's investigating the breach and has informed law enforcement. In a statement Wednesday, it said that it isn't at liberty to disclose the names of companies affected AMCA has said that it's investigating the breach and has informed law enforcement. In a statement Wednesday, it said that it isn't at liberty to disclose the names of companies affected "due to client confidentiality concerns." (Credit: Shutterstock)

(Bloomberg) — 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 key members of Congress.

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