A Brooklyn doctor whose life was “destroyed” after he was wrongly swept up in an insurance-fraud investigation is suing the city and the District Attorney’s Office for $75 million.

“It took me a lifetime to establish a practice . . . it vanishes right in front of your eyes,” cardiologist Abdul Q. Malik told The Post.

Malik had a thriving, 4,000-patient practice in Prospect Lefferts Gardens when police showed up in March 2015 at his Brooklyn home, slapped handcuffs on him and hauled him to Rikers Island.

One of nine doctors accused of taking part in a scheme to defraud Medicaid and Medicare by offering homeless people free shoes and boots in exchange for billing for bogus medical tests, it took Malik’s lawyers months to clear his name, according to the Brooklyn Federal Court complaint.

Malik was targeted by probers after his identity was stolen by a medical testing company he did work with. He was accused of taking $10,000 over two years.

Charges were dismissed against the married father of three in November 2016, but he had been fired from Methodist Hospital and saw most insurance companies terminate their relationship with him. His practice is about a third of what it was, the 59-year-old said.

“I used all my life savings just to keep the office open,” he said.

“We had to fight them tooth and nail every step . . . it prolonged this,” said lawyer Emel McDowell.

The Brooklyn DA’s office declined to comment.