(Reuters) - Pfizer Inc
In a regulatory filing, Pfizer said it received subpoenas in December 2015 and July 2016 related to groups that help cover patient co-payments for prescription drugs.
Pfizer said it has been "providing information to the government in response to these subpoenas."
Medicare is the U.S. government healthcare plan for seniors.
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(Reporting By Deena Beasley; Editing by Cynthia Osterman)
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