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Wellmark Blue Cross and Blue Shield filed a lawsuit Tuesday in the U.S. District Court for the Southern District of Iowa seeking to block the state’s enforcement of parts of Iowa’s new pharmacy benefit manager (PBM) reform law, Senate File 383, that a federal judge has already partially halted.

The judge’s order, however, applies only to plaintiff businesses, their workers and health care agents.

Wellmark seeks to extend to its customers the same protections that a federal court granted earlier this year to members of the Iowa Association of Business and Industry (ABI) in a related case.

The state’s largest health insurer argues the Iowa Insurance Division’s directive requiring insurers to c

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