A physician who maintains offices in Baldwin and Brooklyn faces Medicare fraud charges after, prosecutors said, he bilked the federal government out of millions of dollars by filing false claims for services he did not provide to patients.

Prosecutors unsealed the criminal complaint against Dr. Syed Imran Ahmed, 49, of Glen Head, in federal court in Brooklyn on Tuesday, the culmination of an investigation that examined Ahmed's billing practices between January 2011 and December 2013.

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On Tuesday, authorities executed search warrants on six locations in New York, Michigan and Nevada, and filed a civil forfeiture complaint against Ahmed's Long Island residence, which authorities said was valued at about $4 million.

Ahmed, officials said, billed the medical program between 2011 and 2013 for more than $85 million as a sole practitioner. Prosecutors did not say how much of that sum is under suspicion.

Ahmed's attorney, Alex Bateman of Uniondale, could not be reached for comment.

Patients complained that they received explanation of benefits notices with billings for procedures that were not performed by Ahmed, authorities said.

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"As alleged, Ahmed created phantom medical procedures to steal very real taxpayer money," U.S. Attorney Loretta Lynch said in a statement.