Several U.S. senators across the country are urging insurance companies to do their part to combat the opioid epidemic.

Last week, Sens. Sherrod Brown and Ed Markey (D-MA) led an effort to send a letter to the companies which outlined their concerns with addiction treatment coverage. The letter was signed by 15 senators and sent to Aetna, AHIP, Anthem, BCBS, CareSource, Centene, Cigna, Humana, Kaiser, Molina and UnitedHealth.

In a phone conference with journalists Wednesday, Brown said the effort is part of a multi-step process in ensuring effective action is taken.

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