(Bloomberg) -- The American Medical Association asked U.S.antitrust regulators to block two proposed mergers that could reshape the healthinsurance industry.

Anthem Inc. shouldn’t bepermitted to buy Cigna Corp. and Aetna Inc. should be blocked fromacquiring Humana Inc., the lobbying and professional organizationfor physicians said in a letter Wednesday to the head of theJustice Department’s antitrust division.

The AMA, as well as the American Hospital Association, have beencritical of the proposed deals, saying they will reduce competitionand could harm patient care.

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