Michigan sues Blue Cross Blue Shield of Michigan, alleging an illegal health insurance monopoly

Michigan Attorney General Dana Nessel filed a federal antitrust lawsuit on Thursday, October 8, against Blue Cross Blue Shield of Michigan Mutual Insurance Company. The complaint, filed in the U.S. District Court for the Eastern District of Michigan, accuses the company, which describes itself as Michigan’s largest nonprofit health insurer, of illegally maintaining a monopoly. These are the state’s allegations; the company says it has not yet been served.

The state says the insurer controls 65% of the market for health insurance products in Michigan and 79% of the market for PPO plans, a type of plan that lets members use a wide range of doctors. Michigan Advance reported that the lawyers cite an American Medical Association report for those figures. The complaint alleges the company obtained that position through agreements with other Blue Cross Blue Shield companies to divide customers and territories, restrict products and eliminate competition.

The suit describes two kinds of harm. The first involves prices: the state alleges the agreements prevented competition for the contract to administer state employee health plans and let the insurer overcharge the state for that work for years. Michigan Advance also noted that, according to the Michigan Department of Insurance and Financial Services, Blue Cross filed 2026 increases of 23.3% to 24% for individual plans and 11.2% for small-group plans.

The second involves doctors and hospitals. The state alleges the insurer used its market power to pay health care providers some of the lowest rates in the country, at times below the providers’ own costs, and that providers have reacted by cutting services and staff or closing facilities. The attorney general’s office points to the June closure of the hospital in Sturgis, which cited inadequate reimbursement for rural care, and to a 2026 dispute in which the insurer proposed a 30% cut in rates to Michigan Medicine.

The complaint brings eight counts: two under the federal Sherman Act, four under the Michigan Antitrust Reform Act, one for public nuisance and one for unjust enrichment. It asks for a jury trial, a permanent order barring the alleged conduct, and damages, disgorgement and civil penalties. “Today we’re taking a significant step toward ending the Blue Conspiracy and their illegal monopoly,” Nessel said in the state’s announcement.

Blue Cross Blue Shield of Michigan told Michigan Advance it was “blindsided” by the announcement and, because it had not yet been served with the suit, could not comment on specifics. “We fundamentally disagree with the Attorney General’s characterization of an uncompetitive insurance market in Michigan,” its statement said, adding that “competition exists everywhere in our state’s insurance markets.” The company describes itself as a nonprofit that has operated in Michigan for nearly 90 years as part of the national Blue Cross Blue Shield system.

Sources