CEDAR RAPIDS, Iowa ( Iowa Capital Dispatch ) - A third lawsuit has been filed against Iowa’s insurance commissioner over the legality of a new state law regulating pharmacy benefit managers.

A group of insurance companies argue Senate File 383 , signed into law earlier this year, “upends the prescription-drug coverage that Iowans receive and prevents health-benefit plans from communicating cost-saving information about one pharmacy over another.” The lawsuit claims federal law preempts that sort of “interference,” and the First Amendment prohibits the law’s restrictions on free speech.

The lawsuit was filed Thursday in U.S. District Court for the Southern District of Iowa by OptumRx, a pharmacy benefit manager headquartered in Minnesota, and by several insurance providers or health p

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