The plot involved 10 doctors, 9 separate clinics in New York City and 105 different corporations, all in service of a health care fraud ring that federal authorities say conspired to steal more than a quarter of a billion dollars from insurance companies. And when the details were announced on Wednesday, they cast an unflattering spotlight on how immigrants from the former Soviet Union have often dominated such schemes in the city.

This one, like many others, was rooted in Brighton Beach, Brooklyn, the locus of the city’s Russian-speaking immigrant population, many of whom grew up under a Communist system that bred disdain for the rules and a willingness to cheat to get around them.

Brighton Beach has one of the highest rates of health care fraud in the nation, according to federal statistics. In fact, an analysis of data from the Centers for Medicare and Medicaid Services, the federal agency that regulates those two programs, shows that more health care providers in the Brighton Beach ZIP code are currently barred from the programs for malfeasance than in almost any other ZIP code in the United States. (The top spot is in southern Florida, with its high proportion of older residents.)

“This is the Russian mind-set, and this is why it’s endemic in the system,” said one law-enforcement official who has investigated organized-crime groups from the former Soviet Union. “If you’re not scamming the system, if you’re not scamming the government, you’re not doing what you’re supposed to be doing — you’re looked upon as a patsy.”