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The nation’s two largest dialysis chains, Fresenius and DaVita, said on Friday that they had received subpoenas from the Justice Department for information about their relationship to a charity that provides assistance paying the insurance premiums of needy patients. A spokeswoman for the charity, the American Kidney Fund, also said it had been subpoenaed. (Abelson and Thomas, 1/6)

Justice Department investigators are probing a controversial arrangement under which kidney-care companies support charitable efforts to help patients pay health-insurance premiums, according to disclosures from major dialysis providers. (Wilde Mathews, 1/6)