The federal government frequently alleges cases of overpayment to MA plans, which now cover about 42% of people in Medicare.

It April, it said Humana had overcharged the program by nearly $200 million for submitting documentation claiming patients were sicker than they were. A month later, it alleged Anthem received $3.4 million extra because it wrongly classified patients as high-risk.

Then in August, Aetna disclosed in a filing with the Securities and Exchange Commission that HHS OIG was targeting their MA plans amid recent whistleblower lawsuits.

The findings also come amid outside research showing that MA members cost the government $321 more per person than those enrolled in the traditional Medicare program.

HHS OIG is calling for greater oversight amid the findings from its latest analysis of risk-adjusted payments in MA.

The report urges CMS to conduct greater oversight of the 20 insurers, which were not named in the report, to determine the appropriateness of those payments. It also calls for periodic monitoring of insurers and whether they received a disproportionate amount of risk-adjusted payments.

As part of its report, HHS OIG analyzed whether certain insurers were using chart reviews and health risk assessments to generate higher payments at a greater rate than their peers.

The watchdog found that most insurers had a proportional amount of risk-adjusted payments based on their size. However, that was not true for all them. About 12%, or 20 insurers, had payments that were disproportionally higher than their size.

Those 20 insurers generated more than half of the $9.2 billion in risk-adjusted payments in 2017 but were responsible for less than a third of MA members. The payments were generated by chart reviews and health risk assessments “that were the sole source of diagnoses in the encounter data,” according to the report.

But one unnamed company stood out even more, OIG said. The company had 40% of risk-adjusted payments from the assessments but enrolled only 22% of MA members.

The Kaiser Family Foundation estimates UnitedHealthcare controlled 25% of MA enrollment in 2017, followed by Humana (17%) and BCBS plans (16%).

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