INDIANAPOLIS -- A new $643 million state contract for prison medical services is the most expensive proposal from four vendors vying to provide the services.

The four-year contract was awarded to Centurion Health of Indiana LLC, at a cost of about $160 million a year. Centurion -- and its parent company, Centene Corp. -- is also embroiled in several controversies and lawsuits, including an allegation of a rigged contract in Tennessee and substandard care in Mississippi.
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