HMOs saw record operating profits in 2015 from their business serving as managed care organizations in the state's public health insurance programs.
The findings being released Wednesday line up with a Star Tribune analysis earlier this month that found HMO income nearly doubled last year as the federal Affordable Care Act expanded enrollment in the Medicaid program.
Those newly covered individuals used less care than expected, contributing to health plan profits.
The HMOs' operating income of $232.2 million last year was a record, according to the report by Allan Baumgarten, an independent financial analyst in St. Louis Park. The average profit margin of 6.8 percent was one of the highest posted, he said, since 2000.
"In the last couple years, you've seen the average revenues to the health plans go up, but you've seen the average medical expenses go down," Baumgarten said. "That's usually a pretty good predictor of profitability."
Overall, Baumgarten's report found that health insurers collectively posted a small loss last year, including policies sold to businesses and individuals.
The state Department of Human Services (DHS), which administers the public programs, said it has made changes in HMO contracts that should deliver more than $450 million in savings this year.
"We are not satisfied to see health care plan profits at these levels," the DHS said Tuesday in a statement. "Along with reducing profits, the 2016 contracts will result in significant saving for taxpayers in 2016 and the years beyond."