Sixteen doctors from metro Detroit are included, accused of ripping off taxpayers for over $100 million.
In the federal complaint, the FBI claims that doctors, nurses, pharmacists and other licensed medical professionals are responsible.
On Thursday the door was locked at the clinic for Doctor Rizwan Qadir in Sterling Heights. The FBI says he is part of a $19 million scheme.
No one answered the door at Qadir's home in Bloomfield Hills. Investigators say he billed Medicare for unnecessary tests and paid a recruiter to bring him patients.
He would then allegedly order unnecessary tests for those patients.
Attorney Todd Perkins is defending Dr. Mohammed Bazzi, a Dearborn pharmacist who is also being charged.
"He is charged with a series of charges that 15 other individuals are charged with a host of different medical offenses," Perkins said. "Medicare fraud, money laundering, structuring, different charges of that nature."
The complaint describes the biggest Medicare takedown in FBI history. The sweep charged 243 people.
Those charged will not be allowed to perform Medicare work as this case moves forward. They stand as charged but not convicted.
"In America everyone is innocent - that's why you have bail, until proven guilty," Perkins said.
In the Detroit cases 24 bank accounts have also been frozen for now as the investigation continues.