Dialysis provider Renal Care Group, Nashville, announced that it has become the latest in a group of dialysis providers to receive a subpoena from the U.S. attorney’s office in St. Louis. The subpoena seeks records relating to pharmaceutical and other services. In December 2004, Swedish-based Gambro Healthcare announced a $350 million settlement stemming from an investigation by the St. Louis office, and earlier this year El Segundo, Calif.-based DaVita and Germany-based Fresenius Medical Care each announced they received subpoenas from the office. Those subpoenas and the one received by Renal Care all seek records dating back to 1996. The U.S. district attorney’s office in the Eastern District of New York also is investigating the four companies. Renal Care said the subpoena shouldn’t affect its $3.5 billion sale to Fresenius, which is expected to close by the end of the year. — by Joseph Mantone