Suit Says U.S. Long Had Doubt About Billings By HealthSouth
Suit filed in May by Justice Department and private whistle-blowers holds HealthSouth illegally billed Medicare for 'one-on-one' therapy when patients were actually treated in groups, often not by licensed physical therapists; says payment issues were uncovered in 1998 probe by Blue Cross and Blue Shield of Alabama, further complicating picture of what top HealthSouth executives knew when issuing profit warning in August 2002; graph of HealthSouth share price (M)