With its best showing to date, the state's MNsure exchange signed up more than 85,000 people for private coverage during the open enrollment period that concluded on Sunday.
The tally announced Monday exceeds a goal in MNsure's budget of 83,000 enrollees by year's end. It's also more than 40 percent ahead of last year's open.
Republican critics noted, however, that MNsure remains far shy of original projections that suggested 450,000 people would buy private plans through the exchange by 2016.
It's not clear whether MNsure will still exceed the enrollment goal by December, since sign-up tallies at the end of open enrollment typically decline over the year.
"This is a significant increase in the number of people who are signing up for coverage relative to last year," said Cynthia Cox, a researcher with the California-based Kaiser Family Foundation.
"Minnesota premiums have increased, so there might [have been] more people looking for financial assistance," Cox said. Another possible factor, she said, is "the increased penalty for people who go without health insurance."
Minnesota launched the MNsure exchange in 2013 to implement the federal Affordable Care Act, which requires almost all Americans to have health insurance or pay a tax penalty. It's an option for the roughly 300,000 state residents who buy private coverage on their own, outside of employer groups and government programs.
Technology problems with MNsure's launch in 2013 cut enrollment, as did a lack of federal tax credits for Minnesotans. Subsidies depend on the cost of coverage in a region, so low premiums in parts of Minnesota for 2014 and 2015 limited eligibility for tax credits.