The Minnetonka-based health insurance giant is Minnesota's most valuable company.
It's to "address the financial risk" being unvaccinated creates for the business.
The special enrollment period has been open for five months.
Hospital and medical professional groups called the policy dangerous for patients.
Figures from 2019 meanwhile show a rise in the number of people forgoing care.
The governor and health officials sent a letter asking health insurers to waive treatment costs.
Getting tested for COVID-19 might not be free even if you're fully insured.
The venue is going beyond the requirements of the Affordable Care Act.
The move comes as rising costs have prompted action at the state Capitol.
It's a change from an Obama-era requirement.