UnitedHealth Group Inc. won a major finding in a long-running lawsuit in which the US Department of Justice claimed the company overbilled Medicare by at least $2.1 billion.

The case began with a whistleblower who said UnitedHealth bilked billions of dollars through the Medicare Advantage program.

The Justice Department lacks evidence to support claims the company withheld Medicare Advantage funds, a legal expert overseeing the case said.

UnitedHealth Group notched a major court win in a legal challenge over its Medicare Advantage billing practices that is stretching into its second decade. | UnitedHealth Group notched a major court win in a legal challenge over its Medicare Advantage billing practices that is stretching into its second decade.

One of the biggest hurdles in Medicare fraud detection is the extreme class imbalance, where fraudulent claims represent less than 1% of the total data. Traditional machine learning models tend to be biased toward the majority class,

By Brendan Pierson (Reuters) -A court-appointed special master has found that U.S. authorities do not have evidence to support their billion-dollar fraud case accusing UnitedHealth Group of keeping overpayments from the government for patients on its Medicare insurance plans.

The Justice Department’s years-long court battle to force UnitedHealth Group to return billions of dollars in alleged Medicare Advantage overpayments hit a major setback Monday when a special master ruled the government had failed to prove its case.