Insurers want to crank up the cost of health insurance premiums by as much as 45 percent for Illinois residents who buy coverage through the Affordable Care Act’s marketplace.

Blue Cross Blue Shield of Illinois, the most popular insurer on the state’s Obamacare exchange, is proposing increases ranging from 23 percent to 45 percent in premiums for its individual health-care plans, according to proposed 2017 premiums that were made public Monday. The insurer blamed the sought-after hikes mainly on changes in the costs of medical services.

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